Annoying?

I've known this one girl for several months now and we've become pretty good friends. Whenever I see her in person we usually talk and have a pretty good time. Whenever i've asked her to do something with me before she always seemed very interested and we've always had a good time. I only get to see her about once or twice a week, so i usually talk to her on facebook, but recently I'm kind of getting the feeling that I might be getting a little annoying on facebook. She has only started a conversation a couple of times, so i'm kind of wondering if i'm being annoying by talking to her on facebook when i am the one that normally starts the conversation. Would it be better for me to ONLY talk to her in person and forget about facebook even though I only see her 1 or 2 times a week?