I've worked at facebook in past. Facebook has been complimented at a number of interviews and one company I worked for very actively poached fb engineers. It was extremely clear for that company given the resume system even marked resumes with certain desirable companies and the sheer amount of fb employees we hired. I think my current one also has a bias for them. I have tended to stay in social media industry but I've interviewed for other industries and gotten positive reception with facebook. I remember once getting negative reception on going from facebook to a small lidar startup as interviewer viewed it as dropping to lower tier/prestige company.

I have not worked for Uber, but my experience at other big tech companies is they're viewed fine too for engineering talent.

As for non-engineers most of my family/friend group views facebook/similar very positively. Facebook remains largest social media by a ridiculous amount. Nearly 3 billion MAU is something no other social media company comes close. They certainly have negative sentiment too, but there are tons of people happy with them. I have worked at one company that some friends did show negative view and that was tiktok (mostly because of china concerns). Tiktok as worse then facebook in perception and even for tiktok it was still mild thing. It was never a job concern with both of them I found myself in demand anyway.