Please, don't just block/suspend bad accounts; report bad actors whenever possible.
Of course, this isn't always safe. But it really helps us admins if you check the rules of the server the offending user is from and, if they are violating those rules, forward a report to that server.
It's the only defense we have in many cases. We don't see private messages. We can't monitor all accounts' profile contents. Even with 100 moderators, continually auditing all old accounts is unsustainable.
So help us out by making sure we know about the bad stuff before we get defederated.
