Tumblr Launches StumbleUpon… Oops I mean TumblUpon

NY-based microblog service Tumblr has been busy over the past month. They’ve launched reader submissions and photoset functionality. Today they have announced the launch of  ”TumblUpon”.

TumblUpon may sound very similar to another service, StumbleUpon and from what I can tell the basic functionality is the same. As you “like” posts on Tumblr, it learns about your likes and when you use the TumblUpon option, Tumblr will recommend other posts you may like.

TumblUpon uses a frame (grr!) to move from one Tumblr page to another. It allowed me to jump around even though I have never used the like function on Tumblr.

This is an important move by Tumblr as it will help keep readers inside of their network and will help with discovery, something I believe in strongly.

Mashable has additional thoughts on TumblUpon and some metrics that Tumblr will release today.