出典:Wikipedia
出典:『Wikipedia』 (2011/08/02 20:25 UTC 版)
Beacon was a part of Facebook's advertisement system that sent data from external websites to Facebook, ostensibly for the purpose of allowing targeted advertisements and allowing users to share their activities with their friends. Certain activities on partner sites were published to a user's News Feed. Beacon was launched on November 6, 2007 with 44 partner websites. The controversial service, which became the target of a class action lawsuit, was shut down in September 2009.