I have noticed that the online server info block for players online has a bit of a funny header on the homepage of this site.

I reckon it should say "Online on the Server"

Snoop is the new addition by mojang in the latest release that gathers your pc information and sends it to mojang for statistics purposes.

They are trying to find out what power platforms people are using and what versions of things they are running.

You can opt out. Its in the options