I clicked through an image Dara shared on twitter, and .. was suitably awed by the amount of agencies that were keen on knowing I'd looked at this picture of a puppy.
Seems that yfrog is encumbered with an unhealthy number of trackers and pixels and other cruft – thanks to Ghostery for pointing this stuff out
That's 35 of the suckers – none of which are useful to me – they just deposit some number of cookies on my machine, and chew up some amount of network.
Astonishing collection of pixels and trackers