Elvis is in the building! Or at least on your smartphone. Despite being laid to rest nearly 35 years ago, the King of Rock n’ Roll still posts on Facebook, and tweets several times a day…here’s a sample: “love me tender, love me sweet, never let me go… hashtag Valentine’s Day deals at Shop Elvis!” The BBC’s Matt Danzico recently looked into the social media afterlives of departed celebrities – he lets us in on how they do it.