I really like this girl and what can I talk to her about?

[Jay]

I dont get a chance to talk to her because of the schedule she has.in spanish she usually says hi but this week we didnt talk at all. I have her as afriend on facebook and i want to message her by saying hi but if she responds i dont know where to take it from. What can i say
*Also with this be ok to say "Hey, how was your weekend?"

[Hannah]

that would be ok to say cause girls wanna know that u care about them... talk about an upcoming event like a test or a party or a field trip, something that both of you know about.