<human>: Can you succinctly summarize the text in 1-3 sentences?

I met Megan [19F] in my a political science class last quarter. I noticed her on the first day and thought she was really beautiful, and her friend John [19M] who was also in the class was in my quiz section, so through him, I began sitting with both of them every lecture.

Occasionally, John would not be in lecture and so it would just be Megan and I sitting together. Conversations were normal, but she was really nice and I thought she seemed really cool.

I have her added on Facebook and we follow each other on Instagram, and she likes all my new photos on Instagram, but we haven't talked or seen each other since class ended in June.

So my question is, how should I go about asking her out? I'm not super good at this stuff but I would really like to ask her. Do I just send her a Facebook message asking to get lunch sometime? 

Thanks for any help :)
<bot>: I want to ask a girl out from my previous quarter class, but we have talked since the end of the quarter in June. How should I go about asking her out?