Like many startups, Facebook is confronted with a growth problem. Its outstanding traffic (30-35m unique visitors a month) is no longer growing; newcomers tend not to stay with the service as much as the early adopters still do; the Google-induced OpenSocial protocol is a threat and advertising has not taken off as promised. Recently, the investors in Facebook imposed teenage supervision of a kind: they hired Sheryl Sandberg, a former Google executive (see her interview at the D6 Conference)

Facebook is under more pressure from its investors as explained in New York Times DealBook. There, a professor of economics brilliantly reminds Mark Zuckerberg what are the rules of high tech funding. (For an overview of the social network current situation read also the story in Fortune)