Hi,
Not at all , signature in the main thread is displayed to show support only.
There is actually 2 giveaway on our social network:
https://preview.ibb.co/bLGdJ9/giveaway_fb.png
https://preview.ibb.co/bAEnBU/giveaway_twitter.png
Just clik on the picture to access
It looks like meannwhile the givaway has expired. It was anyway just like a lottery, with low chances to get the coins. Don't like to gamble....