2 situations happened to me recently:
Example 1:
-on a night out she took a picture of just the two of us (nothing happened at all that night, and still). She put it up on facebook, I tagged myself. Few days later, I tag her, she comments "why the tag maaayne"? I go straight up on fb chat saying:
Me: because you have a cute smile, besides, people see you with me and it will make u popular, I think you should keep it

Her: then I can have more friends yaaaay, I will keep it
I am a popular guy and I KNOW at that point she was interested in me. I demonstrated that SHE's the one who is previleged to be seen with me (I'm 6/10 looks and she's a good 8.5-9)
Example 2 over texting, a cousin of my dorm-mate I met just once before:
Her: I'm on my way to uni, r u around?
Me: yea, c ya when u get here x
Her: change of plan, too much traffic!
Me: that sucks, coz tonight is the jamming night with the people who just got back, maybe another time
Her: I got excited but then my sister said she won't drive me, I'm not driving today

Me: well, were gonna be up til late, its still early now, u can try, or just another time
Her: I'll keep u posted
She never did
After her second msg I was getting suspicious its a lie (shit test), after her 3rd msg I definately knew she was lieing (compare the 2nd and 3rd msgs, that's how dumb some of them r)...this is where u guys need to watch out, 2 months ago I would of replied with a "please try to come", here I've shown that "she's the one missing out, I'm gonna have a sick night anyway", no neediness and high social status, also an opportunity for the future to invite herself over, otherwise I would of made a good example of "the cat string theory by Mystery" which is VERY IMPORTANT topic btw
Hope this helps, feedback on my responses r welcome