Absolutely, but. If Microsoft owns it in the context of social media, that changes everything.
Sure there's a Delta Airlines and a Delta Faucets. If I wanted to start Delta Carpentry of Iowa that wouldn't be an issue. However, if I bought Alaska Airlines, woke up tomorrow and rebranded it Delta - you can be sure they'd fly their lawyers out to Anchorage out on a Gulfstream.
But is Meta actually using it? I haven't seen it. Good luck to them trying to defend the mark id they aren't actively using it (or even worse, never did).
> Providing on-line chat rooms for transmission of messages among computer users concerning video and computer games; providing on-line electronic bulletin boards for transmission of messages among computer users concerning video and computer games
Under the prosecution history, it shows activity every few years.
Maybe you're right, maybe if this goes to trial or something, it won't meet the burden? I wouldn't want to be on the other end of Satya's legal team though.