There are a few things you can do to ask a girl for her number on Facebook if you want to get to know her better.

  1. Start by asking her out on a date. This will show that you are interested in getting to know her and that you are not just looking for numbers.
  2. Post a message on her wall or in an online forum asking if she would like to go out for coffee or dinner sometime soon.
  3. Ask her out on a date and take the opportunity to ask her about herself, what she likes and doesn’t like, and what kind of person she is. This will help build trust between you two and make it easier for you to get in touch with her again in the future.