You can get bitcoin from faucet but the income is slow, but you can still earn more and faster income from signature campaign and social campaign, I think by participating in campaign is the best way to get btc from online.
This is the easiest way and no investment required to earn bitcoins. Some members joined here because of signature campaigns. The only thing that you need is patience and if you can wait till you ranked up and can now join on sig campaigns.
Signature campaign is the one method of earning bitcoins. You can invest or earn without investment in bitcoins. Campaigns will give some decent amount for a week but you can find more money with your skills in bitcoin technology and economy system.