An activity stream is a list of recent activities performed by an individual, typically on a single website

Website

A website, also written as Web site, web site, or simply site, is a collection of related web pages containing images, videos or other digital assets. A website is hosted on at least one web server, accessible via a network such as the Internet or a private local area network through an Internet...

. For example, Facebook

Facebook

Facebook is a social networking service and website launched in February 2004, operated and privately owned by Facebook, Inc. , Facebook has more than 800 million active users. Users must register before using the site, after which they may create a personal profile, add other users as...

's News Feed is an activity stream. Since the introduction of the News Feed on September 6, 2006, other major websites have introduced similar implementations for their own users. Since the proliferation of the activity stream on websites, there have been calls to standardize the format so that websites could interact with a stream provided by another website. The Activity Streams project, for example, is an effort to develop an activity stream protocol to syndicate activities across social Web

Social Web

The social Web is a set of social relations that link people through the World Wide Web. The Social web encompasses how websites and software are designed and developed in order to support and foster social interaction. These online social interactions form the basis of much online activity...

 applications. Several major websites with activity stream implementations have already opened up their activity streams to developers to use, including Facebook and MySpace

MySpace

Myspace is a social networking service owned by Specific Media LLC and pop star Justin Timberlake. Myspace launched in August 2003 and is headquartered in Beverly Hills, California. In August 2011, Myspace had 33.1 million unique U.S. visitors....

.

Examples

• Facebook
  Facebook
  Facebook is a social networking service and website launched in February 2004, operated and privately owned by Facebook, Inc. , Facebook has more than 800 million active users. Users must register before using the site, after which they may create a personal profile, add other users as...
  
  's News Feed
• MySpace
  MySpace
  Myspace is a social networking service owned by Specific Media LLC and pop star Justin Timberlake. Myspace launched in August 2003 and is headquartered in Beverly Hills, California. In August 2011, Myspace had 33.1 million unique U.S. visitors....
  
  
• Salesforce.com
  Salesforce.com
  Salesforce.com is an enterprise cloud computing company headquartered in San Francisco that distributes business software on a subscription basis. Salesforce.com hosts the applications off-site...
  
  's Chatter
• Traction TeamPage
  Traction TeamPage
  Traction TeamPage is a proprietary enterprise 2.0 social software product developed by Traction Software Inc of Providence Rhode Island.TeamPage is one of the first products in the enterprise blog and wiki market, with Traction release 1.0 shipped in 1999....
  
   Release 5.0 adds activity streams to Enterprise 2.0 social software platform
• Ektron
  Ektron
  Ektron is a privately held software company based in Nashua, New Hampshire. It provides web content management and social software. Ektron's primary product is CMS400.NET, which is built on the Microsoft .NET Framework. Version 8.5 of CMS400.NET was released in July 2011.-History:Ektron was...
  
   CMS400.NET Release 8.0 adds activity streams to its social software suite
• Trilog Group ProjExec 5.0 brings the Project Wall and Social Project Management to the IBM Plaform
• Foragr Activity Stream unifies Facebook likes, Twitter retweets, Disqus comments, IntenseDebate comments, and WordPress posts into one stream for those running on WordPress or other platforms