Yahoo buys Tumblr in an effort to reach a younger audience.

Yahoo's Tumblr acquisition is a big part the mission for new CEO Marissa Mayer — a mission to make the aging Internet company cool again.

No need to cover everything when you can just cover owls looking hungover. We delve into some strange Tumblrs.

Her influenced has reached President Obama's 2012 re-election campaign. His just-announced Tumblr site asks readers to submit their stories to help…

You know what I mean?…