Beware survivor bias. How many acquisitions has Facebook/Meta made? (answer: a lot). How many are social behemoths? (answer: 2). We don't know how many he tried to make successful and failed at, because we don't hear of them, or don't remember them.
The whole Oculus mess does seem to indicate he doesn't have a Midas touch. And let's not forget the metaverse, which isn't going at all well.
Never heard of Workplace before (unless that's the metaverse thing, in which case it's clearly not successful). And "threads is successful" is dubious: the key point of the article is that it isn't.
Workplace is private Facebook for large orgs. So just Facebook. Doesn't seem like a total flop, though.
I'd rather think that Facebook had been consistently successful in catering its cohort. That targeted cohort might just have too little overlap with users in market for Twitter/Mastodon/Threads, but as far as Facebook/Instagram(post-acquisition) are concerned the users seem satisfied with Meta-run social media to me.
The whole Oculus mess does seem to indicate he doesn't have a Midas touch. And let's not forget the metaverse, which isn't going at all well.