CoComment

coComment was an online service that let users keep track of their comments on any website. The service was based in Geneva, Switzerland, and founded in February 2006 by Swisscom. After a user installed the coComment bookmarklet or web browser plug-in, they could use it to track their comments and any replies to their comments on any webpage that they visit. The service had over 1.3 million users as of July 1, 2008.

Shut down
coComment was switched off in March 2012.