If you see a blue verified seal on any Twitter page, it is sort of a confirmation from the Twitter staff that the account is real and doesn’t belong to any impersonator.
Though any Twitter user can put a request to get their account verified, Twitter has so-far only verified accounts of celebrities, brands, musicians, politicians and other well-known faces.
If you like to see a complete list of verified accounts on Twitter, here’s a trick. Open the twitter profile of @verified and browse though the friend’s list (profiles that @verified bot is following on Twitter).
When Twitter verifies a new account, the @verified bot starts following that person (or brand) and thus we know who all enjoy the verified status.
Related: Do Interesting Things with Twitter
These verified accounts are organized in Twitter lists making it easier for you to follow them all with a click. Surprising, the accounts of both Twitter founders - @ev and @biz - aren’t verified yet.