What happens when you add one bit of information to a black hole

The size of the event horizon increases proportionally to the plank area for each bit added.

I don't really know; but the the BH entropy (disorder) may be increased / the temperature of the BH may rise. Or nothing happens as the information is released back into the universe (as soon as it is added to the BH?).

It is thought now by most cosmologists that information is not lost (after Hawking and his famous Dublin lecture).

Worth reading up on the AdS/CFT correspondence (but not for beginners)
http://en.wikipedia.org/wiki/AdS/CFT_cor…

It becomes heavier. The 'information' is destroyed, becomes purely energy/mass. No coherent information can be left.

You have order and no black hole. By nature they are chaotic.

One bit comes out.