Judging from the above tweet, it looks like someone on the social media team at StubHub was a bit overeager to start their weekend. They then tweeted this: "Tweet," which doesn't make much sense. Perhaps they were drunk. The tweets were soon deleted, and followed up with:
My guess - and I'm only guessing this because I just learned you could do this - is that someone tweeted from the wrong account on their phone. But maybe not. I also just figured out how to check my at-replies, so what do I know.
Regardless, that particular social media "expert" is probably out of a job now.