Expiry: Unknown Report Expired Deal
This game has been out since the summer and is pretty damn fun. Basically a simple facebook game where you collect chips, bet with them, and earn loyalty points for comps. It's 100% free and pretty damn easy to get comps.
Some of the more popular one are Bellagio Buffet, all the Cirque shows, and lots and lots of room offers. You don't have to pay resort fees if you get comped by them.
I have over 300,000 loyalty points now which wasn't hard to get. Bellagio lunch buffet for 2 cost 21k lp, freshly made crepe at Aria for 6000 lp, and 2 tickets to LOVE for 85250 just to give you an example of what things cost.
https://www.facebook.com/myvegas - There's the link to their facebook page.
http://www.justmyvegas.com/ - Guides & More details of specific rewards
Facebook group page - go down to the 500+ chip thread and there should be a giant list of chips. Use that and you'll start out with like 30-50k chips.