Why would a girl give her info to a guy and never respond while she was staring all the time?

i meet a girl in a café shop she was making a lot of eye contact about 8 9 times while m not in her visual field so i ask her to give me her instagram or facebook i gave her my phone and , she gave her info: name , her place , insta & fb.. then, i texted her and she is not responding !!
Why would a girl give her info to a guy and never respond while she was staring all the time?
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