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Re:Peter Thiel: The Online Privacy Debate Won’t End With Gawker by dragonwriter on Monday August 15, 2016 @07:24PM (#12294328)
> That's kind of what ad hominem is...

Strictly, the fallacy involved is tu quoque -- if it is used to rebut the argument which is inconsistent with the persons behavior -- not ad hominem. They are related, but distinct.

Although I suppose if one took the route of:

  1. A says X, 
  2. But A acts in accord with not-X, 
  3. Therefore, A is a hypocrite.
  4. And, because A is a hypocrite, one should disregard A's arguments
You could actually make an ad hominem out of the accusation of hypocrisy.
Re:Peter Thiel: The Online Privacy Debate Won’t End With Gawker by jdmichal on Tuesday August 16, 2016 @10:48AM (#12297796)
Sure. tu quoque is just the specific case of ad hominem being used in this instance. ad hominem is any logical argument which attacks the arguer instead of the argument itself.

https://en.wikipedia.org/wiki/Ad_hominem#Tu_quoque