Two! I hate when it moves the stuff around just as I am about to hit a link and hit an ad instead. It's hard enough without the page moving due to my large fingers.

Also:

* Popups asking me to download app

* Auto starting video of any sort

* Not loading the complete page so it has to keep loading as you read. This is very inconvenient when sitting on the train or subway with lots of tunnels.

* Link/button for "Read full story" on the story it self.

Most of these are reason enough for me to never visit the page again.