Earn free Bitcoins by gambling.

There are a lot of sites out there that give you free bitcoins over a specific amount of time.

https://win88.me/ gives 0.00002000 over 180 seconds (only if you don't have none).
I have the best expirience with win88, one time i have made over 1BTC from free bitcoins.

http://freebitco.in/  win from 0.00000419 to 0.41877801 BTC every hour.
I havn't payed out from freebitco.in yet, but i know they are trustable because i am also on a partner site and they have payed me.

Thanks for reading and hope this may help you.