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I just posted this +CNET article, thanks to some handy FOIA'ing from the ACLU. Here's an excerpt:

*Federal police are increasingly gaining real-time access to Americans' social-network accounts -- such as Facebook, Google+, and Twitter -- without obtaining search warrants, newly released documents show.
The numbers are dramatic: live interception requests made by the U.S. Department of Justice to social-networking sites and e-mail providers jumped 80 percent from 2010 to 2011.*

Unfortunately, we don't even know the extent to which the DOJ/FBI/DEA/Marshals/etc. are gaining access to social network accounts. IP addresses, sure, and port numbers too. But how about +1s or likes? Circle of friends? Pokes? Etc. 

Alas, DOJ is -- not surprisingly -- not exactly eager to respond to my questions...
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Are they reading public posts? Isn't this kinda like the NSA reading Usenet?
 
The article goes into some more detail. The content of posts would require a different type of court order, not the trap and trace/pen register orders today's stats cover. 

In general, though, knowing who someone is communicating with, or who their social network includes, or what IP address they're using could be more useful (from the FBI's perspective) or privacy-jeopardizing (from the ACLU's perspective) than reading the content of posts.
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