Is there any way to purchase a social username that is already taken? If yes, how can I do so?

Question

I would like to get a username on social media  that is already taken. Example:
facebook.com/USERNAME ... twitter.com/USERNAME and so on... 
How can I do that? Is there any legal website where I can buy the usernames from?

P.S It is for business purpose!

Answer

I don't think you can do that. A username is made solely for a person to be able to look someone up on a social media site, without a thousand results like what you get on Facebook.

Is there any way to purchase a social username that is already taken? If yes, how can I do so?

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