I've said this elsewhere, but I don't think you can call Threads a success yet. It could turn out to be, but simply getting signups doesn't mean much when they had the built-in Instagram audience. I signed up a couple of weeks ago but probably spent less than 10 minutes on it since then. I also signed up for a few other Twitter knockoffs that I barely use. For the record, I use Twitter a lot less now too.

They still have billions of Facebook members but usage keeps plummeting. Unless they can provide something really new and compelling, which doesn't seem to be in Zuckerberg's toolbox, Threads is likely to fizzle out.