It used to be like that, but these days I often encounter the opposite, with ex-FAANG people having stigma attached to them, though arguably mostly google. FB is I think second in that.
Outside (even more outside USA), and also in terms of workplace environment "feeling" and choice of projects, things get a bit different.
Is there still clout? Yes, definitely. But it stopped being automatic badge of merit, at least according to friends who either work(ed) in FAANG companies, or were on the other side of recruitment involved.