https://phys.org/news/2018-05-california-high-court-social-media.html

At issue are requests by a defendant accused in a San Francisco slaying who wants videos and other content posted to Facebook and Instagram by the victim and a witness. The defendant, Lee Sullivan, and a co-defendant, Derrick Hunter, also sought information from Twitter.

Prosecutors charged the two men with murder in an alleged gang-related drive-by-shooting in 2013. Sullivan said the witness was his former girlfriend, and her social media posts would show she was jealous and angry because Sullivan was involved with other women.