I went back to university after the on year of army, all the people whom I tend classes are new for me, few who I know from earlier. And ofcourse there´s one girl. I´ve noticed she looks at me quite a lot. (I always sit furher back from her so it´s easy to see.)
Two weeks ago we had a lesson where we had to do some experiments, we were in one team.
So I was putting weights on the object and she´s writing down the numbers. We messed up, and had to do it all over again becasue she had to tell me when to stop putting the weights on

. (This was hour long experiment.)
Overall it was fun, it was first time I got to speak with her. I teased her about it, she was laughing and enjoing it.
Few days go by and I wanted to talk to her more. I wanted to open her with something playful like "Ready to make a mess next week?" in person.
But she is never alone, always with some certiain male friends, who I dont know. So this didnt happen. On saturday, I didnt add her, just sent a message in fb. I knew facebook would be shit, but still better than nothing.
I went with basically same message I wanted to tell her in person.
She responded: "haa yes we could...so we get to sit there more than others, again...Must take max from lesson!"
next day I respond with: "It was quite fun. And you were the only one who, didnt take the max - lazybones

."
No response for that.
Yesterday we had that same lesson again just different experiment + it was like 7 people in group. So I was standing on the one side of machine... doing work, she on the other + the other people around. I could tell she was nervous, she was also blushing. We didnt talk to eachother at all, just looks.
Now I think ill just be cool like always, if I see her alone I go talk to her in school, open with "Arent you such a popular one" (because shes always with some friends). - That doesnt sound needy to me SPAM. Or write her on fb something like "Woah, choclatecookies with milk are the best!

"
What would you do?