Answer the question of the previous poster, and leave a question for the next poster to answer.
Don't make your questions too complex or long. Try yes/no questions or ones that can be answered fairly quickly. The questions can be about the next poster, or it can be about anything else. Try to keep them clean and not too personal.
If you get a question you can't answer, just say "I don't know"
So lets start....
What's your over-used word or phrase?