OK, I know a bunch of us have done 'install this app, fill out this survey, join this website' "offers" for free bitcoins. If you haven't, and are considering, let me tell you this:
I did some offers with freebitcoins.betcoin.co first. Every single offer was "pending" for weeks after I completed it, so I contacted the back-line company offering the exchange, SuperRewards. They were polite and quick to credit all of the offers I had completed.
That was a month ago. My balance is still sitting at freebitcoins.betcoin.co, with no way of me getting it out. There is no "pay now" button, there is no "extract my BTC" button, and worse of all--there is no contact information. They have a small amount of BTC that I earned, and are NOT paying it out!
The second site was freebitcoins.org. Same story--complete the requirements, they list everything as "pending", and don't pay out. They have a contact address, but they don't reply to it. They have a facebook page, but they don't monitor it. It seems like they were decent until a few weeks ago, at which point they just abandoned their service.
The annoying thing in all of this is that you are paid SO poorly for your effort (including contacting SuperRewards, etc.) that they have to be making some profit. The model works for them even if thye don't cheat, but they all seem to do so.
Don't waste your time or effort on these sites. They're not worth is.