I am not really sure why, but when people use the phrase "speak to" in place of "discuss" or "elaborate on" it really bothers me. I know there are cases when it is the most applicable phrase, but seriously, it drives me crazy.
I also am not a fan of the term "effect change." I understand that logically it makes sense, but it still bugs the crap out of me. I can also not accept someone being labeled an "agent of change."