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This is a list of notable social software: selected examples of social software products and services that facilitate a variety of forms of social human contact.

Blogs

Main article: Weblog software

• Blogger
• Community Server
• Xanga
• Wordpress
• Typepad

Clipping

• Google Notebook

Instant messaging

Main article: Comparison of instant messaging clients

Internet forums

Main article: Comparison of Internet forum software

Internet relay chat

Main article: Comparison of Internet Relay Chat clients

eLearning

Main article: Virtual learning environment#List of some Virtual Learning Environments

Massively multiplayer online games

Main article: List of MMORPGs

Media sharing

• Dailymotion
• Flickr
• Fotki
• Ipernity
• Metacafe
• Putfile
• SmugMug
• Vimeo
• YouTube
• Zooomr

Media cataloging

Main article: Social cataloging applications

Personals

• eHarmony.com
• Facebook
• Gaydar
• Match.com
• Matchmaker.com
• OkCupid
• Passado
• Plentyoffish.com
• Yahoo! Personals

Social bookmarking

See also: Social bookmarking

• Blue Dot
• BookmarkSync
• del.icio.us
• CiteULike
• Connotea
• Digg
• Diigo
• Furl
• GiveALink.org
• Linkwad
• My Web
• Mister Wong
• Mixx
• Newsvine
• oneview
• Propeller.com
• Reddit
• Simpy
• SiteBar
• StumbleUpon
• Ma.gnolia

Social cataloging

See also: Social cataloging applications

• Goodreads
• Librarything
• Shelfari

Social citations

See also: Comparison of reference management software

• BibSonomy
• bibster
• CiteULike
• Connotea
• refbase

Social evolutionary computation

See also: Human-based computation

• Knowledge iN
• Yahoo Answers

Social networks

Main article: List of social networking websites

Social scripting

• iMacros Firefox Add-On

Virtual worlds

• Second Life
• Active Worlds
• Galaxiki

Wikis

Main article: Wiki software