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 doesnt 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 and other well-known users. For instance, this 
screenshot has a list of all technology related people whose Twitter accounts have been verified.
List of Twitter Verified Accounts
If you like to see a complete list of verified accounts on Twitter, check the friends list of @verified. When they verify a new account, the @verified bot starts following that person (or brand) and thus we know that only 0.002% of Twitters users* enjoy the verified status.
[*] The total number of Twitter users is estimated at 60 million while only 1,224 accounts are verified.
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 – arent verified yet.
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