Why do girls have more facebook friends than boys?

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I'm a guy and I have little over 200 friends, most guys from my school have about 200-500 and I know none that has 1,000. But girls usually have at least 300 friends, I know some that have well over 1,000 friends.

I go on facebook about 1-3 times a week, and I have less than 10 profile pictures and I upload a new picture about every 3 months, I guess most other guys are the same.

But most girls go on facbook more than once a day, and some have hundreds of profile pictures, and I know many girls that change their profile picture every single day. I think girls just have a high amount of friends because they are insecure and crave attention or something like that, I don't care about how many people are paying attention to me.