With Facebook as Alibi, Brooklyn Robbery Charge Is Dropped (NYTimes.com)
Things got a lot more interesting ever since Congress expanded the acceptance of electronic evidence in 2006. This type of info can work for prosecutors and defense attorneys, but I imagine things are going to get more complicated when geo-tagging, etc. has electronic devices speaking for us.
Also, this is perhaps the best alibi since that guy was cleared of murder charges because he was in the background of a “Curb Your Enthusiasm” episode.