Groupon has acquired social shopping site Mertado.com, which lets consumers find and buy products through social networks, including Facebook.

E*Trade Financial is bringing its talking baby avatars to the mobile channel with the BabyMail viral marketing campaign.

Reebok issued a call-to-action via social media sites asking consumers to view a mobile video and enter a sweepstakes by opting in to the brand’s mobile database, achieving close to a 50 percent click-through rate.