A social platform connecting users with their friends across the web that started as a browser based instant messaging program which supported multiple IM services, including Yahoo! Messenger, Windows Live Messenger, AIM, ICQ, MySpaceIM, Facebook Chat, Google Talk, CafeMom and others. Discontinued July 11, 2012.
From Wikipedia:
Meebo was an instant messaging and social networking service provider. Initially the company offered a web-based instant messenger service, extending its offer in more general online chat and even social networking directions. In June 2012, Google acquired Meebo to merge the company's staff with the Google+ developers team.
Meebo was discontinued July 11, 2012, except for the Meebo bar, which was discontinued June 6, 2013.