Time for another refinement of the Facebook user agreement; also see Furor Erupts Over Facebook's Experiment on Users (WSJ)
"Facebook is hardly the only Internet company that manipulates and analyzes consumer data. Google and Yahoo also watch how users interact with search results or news articles to adjust what is shown; they say this improves the user experience. But Facebook’s most recent test did not appear to have such a beneficial purpose.Facebook Tinkers With Users’ Emotions in News Feed Experiment, Stirring Outcry - NYTimes.com
“Facebook didn’t do anything illegal, but they didn’t do right by their customers,” said Brian Blau, a technology analyst with Gartner, a research firm. “Doing psychological testing on people crosses the line.”"