"Let's go back 6 or more months, when Twitter has acquired Posterous, which was probably the only real competitor to Tumblr. Then Posterous CEO said that everything will be fine and that's a great opportunity to be in Twitters embrace. On April 30 they just shut down explaining how to export all the posts to Wordpress.com and Squarespace (paid). Yahoo cannot guarantee that the same situation will not be repeated with Tumblr. They already have microblogging products such as Meme.Yahoo and Yahoo 360, so I really doubt they will try to step on the same rake again. That's why Tumblers are in panic. Wordpress and Blogger will be the winners in this situation anyway."
- Marius