well exactly ... anything that appears unasked-for on my computer is like a trojan (or just malware generally) to me!
I was really asking if you can make it user configurable -- which I'm guessing you can't -- but the way I am blocking it is by adding the following to my hosts file:
Code:
127.0.0.1 s7.addthis.com
127.0.0.1 cdn.wibiya.com