One of the more popular social media platforms aiming to cement its place, Tumblr has begun testing out an instant messaging feature, with plans to roll out in the future. FULL STORY >

Tumblr has urged users to change their password and update their iOS Tumblr app immediately, in light of the discovery of a hole in its security protocol. FULL STORY >

It's official - Yahoo! has acquired Tumblr for a hefty sum exceeding a billion dollars. The question is, what does it mean for both the behemoth and the six year old start-up? FULL STORY >