Google to buy Groupon?

Words came out these days that google is going to buy Groupon. Some analysis about this basically suggests that it can integrate the Groupon ads into its search results, youtube videos etc. It's kind of a surprise to me as I had thought facebook would be the final buyer, especially as facebook is putting special effort into location based services. It also looked to me promising as Groupon is essentially a collective buying site, and if integrated with facebook's socail model, it's easy to add recommendation/reputation context on that. Maybe facebook is doing that by their own? Anyway, let's seat and see how things will be going.