Bitcoin Faucets are sites that give you FREE Bitcoin for performing some sort of an action. They are able to give away bitcoin for free due to the revenue generated from advertising revenue which is monetized by cost-per-thousand impression or cost-per-click revenue models.  Irrespective of the model which is used to sustain the site, these sites are legit and do give away free bitcoins.  Here are some that you may want to test out:

Tim Hentenarr’s Blog: www.hentenaar.com

Bitcoin Town: www.bitcoin.town

Daily Bitcoins: www.dailybitcoins.org

Bit Hits: www.bithits.info

Robot Coin Game: www.robotcoingame.com

Tree Bitcoin: www.treebitcoin.com

Stars Bits: www.starsbit.com