Y Combinator

The community-building and wellbeing platform for the modern workforce

SproutFi is an application that allows investing in the US stock market and works as a social network.

Siglo is a decentralized community internet service provider that focuses on delivering fast and reliable internet connectivity to its users. The company offers a range of connection plans designed to meet the needs of individuals who seek efficient online access for work, study, and entertainment. By enabling seamless uploading and downloading of files, Siglo aims to enhance the overall online experience for its clients, promoting greater accessibility to essential digital resources.

Flocknet is building a search engine that allows users to search their Twitter network by job, workplace, location, and more. Founders use Flocknet to hire engineers, and investors use Flocknet to source leads. Flocknet is a CRM and suite of tools for creators, influencers, brands, and marketers to get the most out of their Twitter pages. Flocknet allows users to organize their network with Tags, seek out the most influential people with Filters, and connect with people they find interesting. Today, Flocknet is helping brands, founders, recruiters, investors, founders, and managers track over two million accounts.

Operator is building a low-code platform that makes it easy to build business applications. With Operator, analysts can build software solutions to common problems and bottlenecks without worrying about managing data or setting up integrations.

Bitmovin Inc specializes in online streaming solutions and server encoding systems, offering a range of products designed to enhance video delivery and user experience. The company's key offerings include a cloud-based transcoding platform known as bitcodin, which supports adaptive streaming for MPEG-DASH and Apple HLS, as well as BITDASH, a suite of optimized clients for various devices. Additionally, Bitmovin provides an Encoding API for real-time content encoding, a Player for delivering video to streaming devices, and analytics tools that help increase viewer engagement through actionable insights. Founded in 2012 and based in San Francisco, California, with an additional office in Klagenfurt, Austria, Bitmovin emerged from the Alpen-Adria-University Klagenfurt and continues to engage in research and standardization efforts in the multimedia sector. The company maintains a strategic partnership with Intertrust Technologies Corporation and has attracted investment from notable firms such as Atomico and YCombinator.

Fam is the best way to socialize on your phone in a way that's most similar to interacting in real life. We’re a social network that helps you connect with friends and new people through live video chat. We believe that the way people socially interact on their phones is fundamentally broken, and causing widespread anxiety, insecurity, and loneliness - and we have the foundation to solve that for an entire generation.

A platform for online communities to submit links, create content, and have discussions about whatever topic that interests them

Bitmovin Inc specializes in online streaming solutions and server encoding systems, offering a range of products designed to enhance video delivery and user experience. The company's key offerings include a cloud-based transcoding platform known as bitcodin, which supports adaptive streaming for MPEG-DASH and Apple HLS, as well as BITDASH, a suite of optimized clients for various devices. Additionally, Bitmovin provides an Encoding API for real-time content encoding, a Player for delivering video to streaming devices, and analytics tools that help increase viewer engagement through actionable insights. Founded in 2012 and based in San Francisco, California, with an additional office in Klagenfurt, Austria, Bitmovin emerged from the Alpen-Adria-University Klagenfurt and continues to engage in research and standardization efforts in the multimedia sector. The company maintains a strategic partnership with Intertrust Technologies Corporation and has attracted investment from notable firms such as Atomico and YCombinator.

YesGraph can boost your company's growth with high-performance invite and referral flows that leverage social graph analysis and an optimal user interface to acquire the best new users.

Signal is a marketplace that focuses on providing cryptocurrency investment advice. It serves as a platform for users to access insights and guidance related to cryptocurrency investments, aiming to enhance informed decision-making among investors. The company is part of a growing trend that leverages technology to facilitate access to financial information and resources, particularly in the rapidly evolving field of digital currencies. Through its offerings, Signal seeks to connect individuals interested in cryptocurrency with valuable knowledge and expertise to navigate the complexities of the market.

Protonet offers a cloud-based platform designed for small and medium-sized enterprises, focusing on social project management and collaboration. The platform integrates communication, file sharing, and project management tasks, enabling teams to work efficiently in a unified environment. By providing a comprehensive IT infrastructure tailored for SMEs, Protonet aims to enhance productivity and streamline workflows.

Bitmovin Inc specializes in online streaming solutions and server encoding systems, offering a range of products designed to enhance video delivery and user experience. The company's key offerings include a cloud-based transcoding platform known as bitcodin, which supports adaptive streaming for MPEG-DASH and Apple HLS, as well as BITDASH, a suite of optimized clients for various devices. Additionally, Bitmovin provides an Encoding API for real-time content encoding, a Player for delivering video to streaming devices, and analytics tools that help increase viewer engagement through actionable insights. Founded in 2012 and based in San Francisco, California, with an additional office in Klagenfurt, Austria, Bitmovin emerged from the Alpen-Adria-University Klagenfurt and continues to engage in research and standardization efforts in the multimedia sector. The company maintains a strategic partnership with Intertrust Technologies Corporation and has attracted investment from notable firms such as Atomico and YCombinator.

A platform for online communities to submit links, create content, and have discussions about whatever topic that interests them

Naytev optimizes how content is shared from websites to social media, creating a 30% bump in referral traffic. They use machine learning to surface and discover effective messages in real time, and prioritize those as users share.

Weave is a mobile-based professional networking application to arrange meetings and friendly discussions. It enables professionals to log into the application through their LinkedIn profiles, and the app then presents them with a stream of nearby professionals who are presumably open to face-to-face meetings and whom they can swipe “yes” or “no” to meet.

Search your intranet from one box" We built a Flickr to Facebook photo migration tool as a overnight hack, and moved half a million photos. We were covered in ZDNet.

NewsBlur is a personal news reader that brings people together to talk about the world.

Diaspora is a community-run distributed social network. It was launched by four students at NYU's Courant Institute. Currently, Diaspora is supported and backed by the Free Software Support Network and the Software Freedom Law Center.

Post.fm offers social email service.

The Fridge is a platform for lightweight single serving social networks for the functionality of Facebook without being on Facebook. The Fridge makes private conversation, media, and event sharing dead simple. The Fridge is like Tumblr for social networks. Anyone can easily create shared spaces, invite their friends and socialize/share photos, videos, music, and more. The Fridge reinvents how groups interact online allowing users to cut through the clutter of their social graph and create lightweight targeted spaces for personal and private relationships, special interest groups or clubs, or any temporary network around events, gatherings or nights out on the town...

Rapportive shows you everything about your contacts right inside your inbox. You can immediately see what people look like, where they're based, and what they do. You can establish rapport by mentioning shared interests. You can grow your network by connecting on LinkedIn, Twitter, Facebook and more. And you can record thoughts for later by leaving notes.

Tweetflow provides platform to build social networking site. The website aid in crowd sourcing and offers various built-in analytics for brand analysis such as language processing technology, automatic identification of questions, and tweets of praise and complaint.

JustSpotted is a celebrity-tracking tool that aggregates and organizes real-time information about celebrities from various social media platforms, including Twitter, Facebook, and Foursquare. Originally known as Scoopler, the service has evolved to focus specifically on celebrity sightings, providing fans with a way to see what their favorite stars are doing at any given moment. JustSpotted collects data from users who report spontaneous encounters with celebrities, thereby enhancing the platform's offerings with real-life sightings. By mapping these occurrences, JustSpotted enables users to easily access and enjoy a curated collection of celebrity activities, transforming the way fans engage with celebrity culture in the age of social media. The service was launched in October 2010 and was developed by AJ Asver, Dilan Jarawardane, and Benjamin Tauber.

Slinkset is a white label social news platform that allows anyone to start a social news site and integrate it into their own website.

SocialBrowse is a Firefox extension for sharing links. It has been described as "a Twitter for links".

Insoshi is a social networking platform.

Deluux aims to become distributed Facebook, or inverted Ning, by relocating the center of people's online identities to their websites, which exist outside of any one social network. The service will facilitate the distribution of personalized content around the web and help drive traffic to websites. It has yet to launch.

Enernetics is the web's largest digital trustmark provider.

SocialPicks provides individual investors with a trusted online investing community where they can invest smarter together.

Founded in October 2006, Justin.tv is an online community that enables users to create, share, and broadcast live videos. The platform allows individuals to stream events, classes, and gatherings to audiences in over 250 countries, facilitating real-time communication among viewers. With a robust infrastructure, Justin.tv supports over 428,000 channels and attracts more than 41 million unique visitors each month, with users watching over 300 million videos monthly. The platform is engineered to handle significant traffic by dynamically adjusting to demand, ensuring seamless streaming experiences. Headquartered in San Francisco, Justin.tv was developed by a team of graduates from MIT and Yale, and it is backed by notable investors such as Y Combinator and Draper Associates.

A service that enables its users to meet and chat when they visit the same websites.

A platform for online communities to submit links, create content, and have discussions about whatever topic that interests them