IMO it’s not that blue check equals credibility, but rather it equals that you are who you say you are. This is a good thing particularly when it comes to public figures/officials — not for their sake, mind you, but for the sake of other people who may see a tweet from them. If the checkmark is there, then it’s them. If not, then it’s an impersonator. Right now it’s difficult to tell.
Tl;dr: it doesn’t make what they say real, it just makes them real.
The sake of credibility? What decides that though? Likes? Likes are a big problem imo. It doesn’t really do anything except create echo chambers.
IMO it’s not that blue check equals credibility, but rather it equals that you are who you say you are. This is a good thing particularly when it comes to public figures/officials — not for their sake, mind you, but for the sake of other people who may see a tweet from them. If the checkmark is there, then it’s them. If not, then it’s an impersonator. Right now it’s difficult to tell.
Tl;dr: it doesn’t make what they say real, it just makes them real.