social media guru
Generally some no-talent dickbag who slummed their way into social media without any knowledge of how to use it for anything other than gaining followers for themselves, attending events, and generally whoring themselves out, because they're 22 and don't know how to business.

See also:

social media -

rockstar

maven
astronaut
ninja
any other horseshit that tries to make them sound important while also being the lowest paid person on staff
"Hi serious client, I'd like to introduce you to our social media guru!"
"Wow, way to throw their credibility directly out the door! I can't wait to work with them!"