The account is a day old. It's going to be a throwaway account. The person running it is just gonna be on a new account the next time you see them.

A more-interesting mechanism might be one that has some kind of trust metric.

Reddit Enhancement Suite remembered how many upvotes and downvotes you'd given a user on past posts and comments and put a total of each by their username, so there was an immediate trust metric available.

There are ways to game that, like building up bogus accounts with a reputation for the specific purpose of agenda-based posting -- but if you've got a group using burner accounts to try to influence social media that has to at least pay for those accounts by producing past helpful and constructive content, I'd say that we're at least starting things off on the right foot. And there are counters to such gaming attempts.