[bandushrew]

great!

how can I choose to deny access to my data?

heh heh. the silly article made it sound as if that wasn't an option. trust the journalists to stuff things up.

so how do I do it?

Edit: I dont use Firefox, so AdBlock is out of the question, and I have no idea what websites do this. Is there a list available somewhere? How can I discover whether or not a website does this without visiting them in the first place?

[sorbus]

Either don't use websites that use this (what the grandparent was suggesting, I believe), or block KISSmetrics in your hosts file. Apparently it's also blocked by Adblock Plus if you're subscribed to the right lists (which are linked to elsewhere in the comments on this story).