Most Helpful Guy
It has some truth in it. You don't wanna come off as creepy, or as if you're interrogating her. Also, you'll talk about yourself because it's what you know the most, and also to show her how you are and make her like you.
Most Helpful Girl
I don't know how true it is, but I know I get sometimes get nervous and feel like silence will make things awkward. They also may be trying to sell themselves.