We need a CA-like system here for verifications. Allow independent orgs to verify in different ways -- employers for their employees, an ID verification company could verify real people, professional associations with their members, etc, and the users profile would show the badges from those orgs.
Twitter verified is problematic because
1) they are the sole gatekeeper
2) there's no granularity
3) lack of granularity creates a 2-tier system
then let users trust (or distrust) the verifiers.