to earn bitcoin you can go for several option which you like most. best ways are : revenue share, cloud mining & exchange.
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Hahaha, It is good to see that people are still using Android App for bitcointalk.org
I was using it too, but this stupid signature made under every post is just simply too annoying for me, Im not going to post on mobile through upp just to log-in on mobile browser to edit post and delete "Posted from bitcointalk.org Android app".
But getting back to the main topic, revenue share is usually a really risky idea, same with cloudmining: most of websites like that are just ponzi schemes or some other kinds of scams.
I would advise just going for trading, it is way better idea than giving your money to someone else.