Sparkz

There's a non-zero possibility Optimus has a second account where he exclusively posts pictures of desk fans because he misunderstood a comment.

Sparkz is a social media website on which users can upload photos and make comments.

Fiction

EarthSpark cartoon

When Robby and Hashtag took Optimus Prime's trailer to be cleaned, Hashtag became engrossed in setting up an account for the big guy on Sparkz as publicity for his upcoming photoshoot with Trucks Illustrated. Unfortunately she was so distracted, she somehow missed Aftermath stealing the trailer from right in front of her. Dude, Where's My Trailer?