Comment by NiekvdMaas

Looking at the http://ubervu.com/ website, it seems they are using a tracking service hosted on http://trackalyzer.com/. This is a privately registered domain (there is no index page either), but from http://trackalyzer.com/w3c/policy1.xml we can derive that this service is operated by LeadLander.com.

The LeadLander product seems to identify users by company name (most likely by checking the IP address/netblock) and then "integrates" with LinkedIn and Jigsaw in order to contact (spam?) the users by email (see: http://www.leadlander.com/web_analytics.asp).

Definitely interesting, but legal? Not very likely...