Have you ever seen a "Link" that tweets?

It was new to me. Looks like an ordinary link, but pops up a Twitter Box with most of the Tweet filled in! The site visitor, who clicked the link that opened the tweet to begin with, simply adds an email address and maybe a "Heck Yeah!"! They Press Da Button -- "And It Tweets like magic" -- Sign up for CTT (Click To Tweet) your first 5 Tweet links are free. So who's seen this before?