Several thousand Tumblr blogs have jumped ship but that's a small fraction of its 100 million users

Tumblr's 100 million users could be just what Yahoo needs to look young and fresh

Facebook is said to be buying navigation start-up Waze, previously courted by Apple

Microsoft puts YouTube on Windows Phone despite claiming Google blocked it

Tweetdeck client continues under tighter Twitter control

Instagram users can now tag people in photos, a feature inspired by parent company Facebook

Social networking users are becoming increasingly hostile to offensive comments posted by others online

Foursquare may not be as hip as Facebook or Twitter, but VCs think location will happen one day...

Facebook is expected to show its 'new home on Android' in the form of a HTC smartphone set for launch this week

Twitter promises to play fair with broad messaging patent