I don't know, so I can't verify if LE shut down SM on this case, but it is not uncommon in other cases. The article linked below is 2 years old, and if LE was doing it then, IMO, it's probably even more common in 2014. IMO, it goes without saying, just another tool of crimefighting in the 21st century. Moo, Jmo, etc...
http://usatoday30.usatoday.com/tech...edia-law-enforcement/53614910/1?fullsite=true
They can and do routinely order social-media companies to shut down a Twitter or Facebook page, for example, immediately after a crime has been committed or have relevant information archived before any changes can be made. "It's no different than physical evidence," says Bob Hopper, manager of the Computer Crimes section at theNational White Collar Crime Center.
http://usatoday30.usatoday.com/tech...edia-law-enforcement/53614910/1?fullsite=true