If it's to good to be truth, most of the time it is. That "give away" on Twitter and other platform are all a scam, specially when they ask you to send money, coins and/or private keys before sending you what they've promised for.

If someone wants to give you coins, and ask you for coins before giving the coins they promised, it doesn't take to be a genius to know it's fake. I mean, if they want to give you something and ask for tx fees or any other way of money, you should stay away from it.

When I send coins to people with whom I'm doing business and the fee needs to be pay by the or something, I just discount the fees from the amount I'm supposed to send and that's it, no need for their privates keys, for an advance or something similar.

This field is 99% full of scammers, you are dealing with the biggest piece of crap that the world has to offer here, people without shame that hide behind a screen to steal other peoples wealth is very common here.

My father say most of the time "In my time, if you wanted to steal from someone you had to get in front of him and confront your victim. He also say that another good way to steal from others was to educate yourself. I guess that in our time you have to be educated (hackers, programmers, ICO founders...) to steal from others.