Does that mean hanging out with friends on the social network is a greener activity than searching? Facebook would certainly like you to think so. In a blog post announcing its carbon footprint report Wednesday, the company broke out the annual carbon dioxide emissions per monthly active user: 269 grams. "To put this into context," says the report, "one person's Facebook use for all of 2011 had roughly the same carbon footprint as one medium latte. Or three large bananas. Or a couple of glasses of wine." 269 grams doesn't sound like a big deal, until you consider that Facebook has 955 million active users. That's a whole lot of lattes. Still, environmental leaders were pleased. "Today's detailed disclosure and announcement of a clean energy target shows that the company means business and wants the world to follow its progress," said Greenpeace International Senior IT Analyst Gary Cook in a statement. Not that there isn't a lot of work to do, as Facebook admits in its report.