in silicon valley who explored facebook's ad business for mit's technology review says the ad part of the social networking company is only growing. >> by all estimates it did a couple billions of dollars in advertising last year and may double that this year. so it seems that the advertising machine has started to take off there. >> reporter: robert hoff adds that facebook's last foret into ads backfired before the company changed its practices. mary snow, cnn, new york. torrential rain and massive floods pounding columbia, show nothing signs of letting up at all. meteorologist jen delgado has the details. >> you're right. the flooding has been bad there, we're talking over the last several months. this is the la nina-induced moisture that's been affectle colombia as well as parts of venezuela. look at this region.