If you have no money to invest on BTC, then I suggest you to spend more time on this forum. You can make some btc throguh signature campaign.
it seems this is the case from what i've seen, but apparently it takes ages until you can post in the required member level, and all good campaings are closed anyway so...
At newbie rank, you may join the Bitin.io campaign to get 0.00004 a post.
When you get to member rank, you can switch to other campaigns like Pocket Dice (assuming it is still open then) and LuckyBit (the campaigns get free spot released regularly).