zlacker

Most of the 3rd parties being used for this are based in the US. You're sending your photo and details to a foreign entity. That same foreign entity is likely used by lots of sites.

Oh look, that foreign entity now has a profile of you, and what sites you've visited.

Fast forward a year, they get hacked (or maybe even just sold), a copy of your personally identifiable details are pinched along with your browsing history.

I really really hope you weren't being naive enough to go down the utterly stupid "nothing to hide" route with your line of thinking.