In that scenario, it should be doable from Twitter not to have new accounts to have the ability to @ at some other account for the first 24 hours after creation

In that scenario, it should be doable from Twitter not to have new accounts to have the ability to @ at some other account for the first 24 hours after creation or something and maybe after 24 hours to be able to @ at someone the new account must have at least 5 follower which in turn have at least 5 followers or something. Maybe not full-proof but it will weed out quite a bit of new accounts purely created for trolling. I'm sure Twitter themselves should be able to come up with a more effective method but it seems they simply don't want to...