ResearchGate

A social networking platform for scientists and researchers that enables them to share publications, collaborate with peers, and engage in academic discussions online.

A video game digital distribution service and storefront developed by Valve Corporation.

Steam Community

A social networking site for gamers.

Google Groups

A Google service that provides discussion groups for people sharing common interests.

A Chinese microblogging website.

Academia

A social networking platform for academics that enables users to share research papers, build professional profiles, and connect with other researchers worldwide.

Xing

A German career-oriented social networking platform focused on professional connections across industries mostly in the German-speaking market.

Meetup

A social media platform for organizing in-person activities and meeting people in your local area.

OK.ru

A Russian social networking service with more than 300 million registered users.

Line

A Japanese instant messaging and social networking app often described as a super-app because it integrates services such as a digital wallet, news feed, digital comics, media streaming, and shopping.

A messaging and social networking app that lets users send photos and videos ("Snaps") that disappear after being viewed by default.

Flipboard

A social news aggregator and content discovery platform.

Douban

A Chinese social networking site and media database for books, movies, music, and local events.

Quora

A question-and-answer platform where users can ask questions and provide answers on a wide range of topics.

Yelp

An American crowd-sourced review platform where users publish ratings and written feedback about local businesses.

Keybase

A key directory, secure messaging and file sharing platform.

Product Hunt

A platform for discovering and sharing new technology products, including apps, tools, and services.