This is something that I think that is very interesting, also if the post is from couple of years ago but considering that freebitco.in still exists and meny users use it every day I think that sharing our experience and resources can be a good idea. I recently found one of the last posts regarding the best strategy to earn bitcoins using freebitco.in is https://www.bitcoin-faucets-that-pay.com/strategy/freebitco-in-strategy-to-start-earning-seriously/

Happy to read also experiences of other users.