Clikball
The name cliKball sounds like a fun new mouse game — and in a way it is. Coming across like a Twitter for link sharing, the plug-in co-created by Jesse Andrews of Userscripts.org fame and three other principles formerly of Flock, allows users to easily alert their fellow URL hounds to their favorite sites at the click of a little red ball in their browser. Aside from sharing with all your followers in one felled swoop, cliKball users can privately spread links to specific groups or persons, and even spread the love on Twitter and Friend Feed.