History of Yahoo!
On March 8, 1997, Yahoo! acquired online communications company Four11. Four11's webmail service, Rocketmail, became Yahoo! Mail. Yahoo! also acquired ClassicGames.com and turned it into Yahoo! Games. Yahoo! then acquired direct marketing company Yoyodyne Entertainment, Inc. on October 12, 1998. In January 1999, Yahoo! acquired web hosting provider GeoCities. Another company Yahoo! took over was eGroups, which became Yahoo! Groups in June 2000. On March 8, 1998, Yahoo! launched Yahoo! Pager, an instant messaging service that was renamed Yahoo! Messenger a year later.
Yahoo! Mash
Yahoo! Mash was a social network service launched by Yahoo! during the early part of September 2007, to compete with other social networking sites by offering "mashups" of existing web services on a single-user interface. On August 28, 2008, Yahoo! announced via email to its subscribing members that Mash would be shut down on September 28.