Question

What is the difference between the "All Activity" tab and the "Questions" tab?

Answer 1

- Question tab answers the question: "what question was asked by whom?". This tab lists only posted question.

- All activity tab answers the question: "Who did what?". This tab logs all activty when user comment on a question/answer, when someone answered a question...

Hope you understand me or someone else will explain more clearly :D

Comments

All Activity also logs edits I think. So you have commented, answered, asked and post edited.