This is definitely not a particularly _new_ idea (I can't recall the name of the service, but there was one -- "Web 1.0" service if you will -- that existed a number of years ago), but I like this implementation. The plug-in, as opposed to a web-proxy method (which is what others I've seen have used), definitely has a more solid look-and-feel. As well, it'll undoubtedly work a lot better since there is no processing of the page involved. This isn't the type of service I would particularly use, but I can see the appeal of it.

Congrats on launching, I'm curious to see how you guys do.

Critsuite (http://zesty.ca/crit/) and Third Voice come to mind.

I've been using SB since alpha and its awesome. I just wish I had more time for surfing the internets right now...

Congrats guys! Looks like a pretty cool idea. Installed it, will start "socially" browsing soon...

I think it would be nice if there were a "Friends" tab so that users could filter links/articles/comments to people they know. Other than that, it looks cool and I'll keep trying it out.

You only receive activity from the people you choose to follow.

Way to go, guys. I have a new favorite exclamation: Garbowza!

I just started using Diigo last week. Is this somehow better?

Wooohoo! Grats to Zack and Dave.