Social tools/List of extensions

The following list contains extensions under the social tools umbrella, ranked by stability.

Stable

AJAXPoll – An extension to allow people to create and vote on polls.
BlogPage – Adds tools for users to create and read blog posts.
Comments – Allows for a ‎<comments /> to allow users to comment on articles.
Contribution Scores - Adds a fun metric for contributors to see how much they are helping out.
FanBoxes – Adds an easier method to create userboxes.
Highly Automated Welcome Tool (HAWelcome) – Automatically posts a welcome message to new users' User Boards if configured to do so; can also be used independently of SocialProfile or other social tools.
ImageRating - Adds a new special page, Special:ImageRating, where privileged users can categorize and rate images.
LinkFilter – Allows for users to submit news links, and for privileged users to approve them.
MediaWikiChat – Adds a special page for users to engage in real-time chat.
NewSignupPage – Enhances the default signup page to require users to check that they agree to the terms of use and privacy policy.
PictureGame – Allows users to create and play picture games.
PollNY – Adds various features to allow for creation and moderation of polls.
QuizGame – Allows users to create and take quizzes.
RandomGameUnit – Displays a random picture game, poll, or quiz.
SiteMetrics – Creates a special page that displays statistics regarding the usage of social tools.
UserWelcome – Adds user-specific social info where the ‎<welomeUser /> tag is present.
VoteNY – Adds a ‎<vote /> tag that allows users to vote on or rate pages.
WikiTextLoggedInOut – Adds ‎<loggedin>...‎</loggedin> and ‎<loggedout>...‎</loggedout> tags that display different content based on a user's login state.

Beta

Challenge – Allows users to challenge each others, and have the loser of the challenge do a specified task (i.e. "edit page X and add info about event Y") and gain points while at it
MiniInvite – Adds two new special pages, Special:InviteEmail and Special:EmailNewArticle, for sending out invitation emails to your friends. This is needed, together with the NewSignupPage extension, if you want to give out points for recruiting users to your wiki.
SportsTeams – Adds networking features to a user's profile regarding sports teams.
UserStatus – Allows users to add status updates to their profiles.
Video – Allows users to import videos from external services such as YouTube and Dailymotion.
WikiForum – Enables a forum on the wiki for users to post in topics and create different boards.