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Diaspora is a federated social networking service, designed to be a more privacy-aware alternative to Facebook . Share what you want, with whom you want.

Friendica is a distributed social network application which runs on commodity hosting platforms - PHP/MySQL/Apache. (If you can install Drupal or Wordpress you can probably install Friendica)

GNU social is a continuation of the StatusNet project. It is social communication software for both public and private communications. It is widely supported and has a large userbase. It is already used by the Free Software Foundation, and Richard Stallman himself.

Hubzilla is a powerful platform for creating interconnected based websites featuring a decentralized identity, communications, and permissions framework built using common webserver technology. Hubzilla is very suitable for communities (of any size).

Ello is a simple, beautiful, and ad-free social network created by a small group of artists and designers.

Choqok - KDE Micro-Blogging ClientThe name comes from an ancient Persian word, means Sparrow!Currently supports Twitter.com and Identi.ca services.It currently features:

Yammer is revolutionizing internal corporate communications by bringing together all of a company’s employees inside a private and secure enterprise social network. Although Yammer is as easy to use as consumer products like Facebook or Twitter, it’s enterprise-grade software is built from the ground up to drive business objectives.

Plurk is a social journal for your life.

Terminal-based Twitter Client with Streaming API support. Only supports Ruby 1.9 and later.

Viadeo is a professional social network used by over 40 million professionals in 226 countries worldwide.Our members consist of business owners, entrepreneurs and managers from a diverse range of businesses - both start-up and well-established. Every day Viadeo attracts more than 30,000 new members; 150,000 new connections are made and over 3 million profiles are viewed. In addition, Viadeo is available in English, French, Spanish, German, Portuguese and Italian.

Jostle Corporation is the creator of a new kind of employee intranet. Jostle’s People Engagement® platform is helping organizations around the world become extraordinary. It creates connected and vibrant workplaces by engaging employees, enabling communication, and driving workplace culture. Our customers achieve employee participation rates of over 85% — that’s over 5X industry norms.

Have you ever wanted to send an article or long conversation over IM or post to Twitter, only to have it be over the character limit? That's what TinyPaste is for. The Firefox addon lets you right click on any selected text to save it; you can also enter text into the pastebin on TinyPaste's website. It automatically presents you with a link to share your text with other users.