Why is curation blown out the box on twitter?

I have followed the discussion around curation on twitter for a couple of weeks, and the volume has been manageable, but in the last two days the volume of traffic on twitter about curation has been huge. I checked out topsy, and it confirmed my suspicion that curation has seen a huge surge in traffic in the last two days. Probably due to these couple of stories all coming out at the same time. The volume may not stay here forever but curation tools are coming out at a scary pace. I hopefully have some more research to publish here about curation soon. - Twitter Curation Grows Up: Storify Becomes Blog & SEO Friendly - Feast Your Eyes On Recipe Curation Site Gojee - Percolate: The Microblogging Platform Where Tumblr And Twitter Go To Hang Out