StraightUpSocial News Links for 2/5/2010

Facebook Begins Rolling Out New Home Page Design

Eric Eldon at Inside Facebook tells us about the new features rolled out to some Facebook users last night, in addition to sharing Facebook founder Mark Zuckerberg’s announcement that the social network has reached 400 million users this week.

Location is Hot: Foursquare Traffic up 3X in 2 Months

Marshall Kirkpatrick at ReadWriteWeb shares a breakdown of traffic stats from Hitwise showing growth to the location-based social network Foursquare, in addition to where the traffic came from.

Smartphones Are Selling Like Crazy

Stan Schroeder at Mashable shares data from market research firm IDC, which shows a 39% increase in the number of smartphones shipped by manufacturers during Q4 2009, compared to Q4 2008.