Facebook finally launches social deal

Refer to this link: http://gigaom.com/2011/04/15/how-facebook-can-beat-groupon-by-making-deals-social/.
Just as I expected in my last Dec.'s post, I thought Groupon is an easy to duplicate model, and should join Fackbook instead of being bought by google or going independent IPO. Now it seems it's missing this opportunity as Facebook already started its own social deal. The deal sharing within a social context would be more effective: anyway, friends often have similar interest and taste, and recommendations from friends are automatically including trust and reputation mechanisms. As long as Facebook doesn't make stupid mistakes in the future, Groupon will be in big trouble.