It's not all sunshine and roses for Twitter's verified users. They may have more features, but that blue checkmark also makes them a bullseye for trolls, spammers and people who simply have a chip on their shoulder. This group should have an easier time having meaningful discussions from now on, though. Twitter has started giving verified iOS users a simple "quality filter" that lets them remove abusive remarks, duplicate content and suspicious accounts from their notifications. The social network already had tailored filtering, but this new option theoretically cleans things up with the flick of a switch.