PUBLIC MARKS with tags presence & twitter

Hictu is a new Web application which allows users to provide and receive availability information about their contacts. Through a one-to-one, secure authorization mechanism users can invite their contacts and in just few minutes retrieve a useful set of information regarding their availability and communication means. See Hictu blog for the latest news, to discuss its evolution and give us a feedback to build new features. Hictu: Your Presence

we round up 12 services that want to track your every move - voluntarily. of interest to twitterers.

Michael Cote's twitter page

A global community couple of servers answering one simple question: What's your website doing? Receive answers on your phone, IM, or right here on the web!