Why are more web companies placing bets on Latin America?

With the recent news that Groupon, the well-funded group buying site, just acquired two start-ups in Latin America, many in the region view it as a sign of things to come. Whereas, previously, only well-financed startups with strong revenues made it onto the radar of potential strategic acquirers; today, smaller startups in the region, such as Argentinean start-up, Three Melons, which was recently acquired by Playdom, are fair game. So, what has changed?