This article is about a flaw discovered in how ATT handles network traffic, although it might occur on other carriers as well. A family using Nokia phones logged on to their Facebook accounts, but were taken into the accounts of other people.
http://www.dailyherald.com/story/?id=351288
The glitch -- the result of a routing problem at the family's wireless carrier, AT&T -- revealed a little known security flaw with far reaching implications for everyone on the Internet, not just Facebook users.
In each case, the Internet lost track of who was who, putting the women into the wrong accounts. It doesn't appear the users could have done anything to stop it. The problem adds a dimension to researchers' warnings that there are many ways online information -- from mundane data to dark secrets -- can go awry.
http://www.dailyherald.com/story/?id=351288