Twitter is a social media platform for broadcasting short messages to the world and followers.

eXo Platform is an open source, standard-based, Enterprise Social Collaboration Platform.

identi.ca is a free and open source social networking and micro-blogging service based on the pump.io software, using the Activity Streams protocol.

Yammer is a freemium enterprise social networking service used for private communication within organizations.

App.net was an ad-free online social networking service and microblogging service.

Tumblr is a microblogging and social networking website.

Known is a publishing platform that allows its users to share their stories online.

Ello is a community to discover, discuss, publish, share and promote the things you are passionate about.

Soup.io is an Austrian social networking and microblogging site.

Plurk is a free social networking and micro-blogging service.