just join a signature campaign.
That's not free, you need a higher rank and you need to post the required number of post. So for me it's not free, It' s a kind of job here in forum.
Yes and if you want to earn bitcoins from signature campaign then you have to work on it on daily basis and you will get your income only if you achieve the target of posting and that cannot be considered as a free as you have to put your efforts time and energy into and if you are looking that you will be getting bitcoins without doing anything then you are wasting your time as that will never happen in real world.