2011

Echo - Build Highly Social Real-time Apps.

2009

Talk Digger: The best way to find, follow and enter conversations of the Web
Home - Blog Flux

shortText.com - Post information. Share it.
l.pr - url shortner

Find, Follow and Share Comments — BackType

IntenseDebate comments enhance and encourage conversation on your blog or website
Chirrup, a comment system for Twitter by Angry amoeba.

DISQUS | Turn Blog Comments into a Webwide Discussion with a Powerful Comment System
2007
2006

Track Your Comments All Over the Internet: coComment
2005

HaloScan.com - Weblog Commenting and Trackback
