Looks like there is some serious play at hand. 4chan has decided they are tired of tumblr "stealing their memes" (it's a bit of a broken record argument yet you have to admit that tumblr perpetuates laziness with regards to giving credit), but tumblr is a pretty large group of people who can stand as one too, so now tumblr is organizing to fight back.
In addition to a variety of measures like DDoS to disrupt tumblr, the main objective of 4chan is to create tumblr accounts, follow people who will then follow back, and then start to spam their dashboards with disturbing pictures.
In an effort to retaliate, after some consideration by tumblr that trolling 4chan boards would probably not be noticed due to the fact that there is so much trolling going on there already, tumblr finally decided the best way to disrupt 4chan boards would be to upload as many pictures of cute kittens as possible.
Operation Overloard va. Operation Overkitten
Cylendars are firing up now. Sunday and Monday could lead to all out war.
http://twitter.com/#!/search/4chan
http://twitter.com/#!/search/tumblr