What is my teen girl going on her phone?

[Lialialia]

First off al she wanted a smartphone , so i go her on her 14th BD Samsung galaxy ace , then she said she wanted an Iphone , becoause everyone was them , so i said no ......She got over it . But now she is useing the phone 24/7 , idk what she is doing , she is always on her phone she has Facebook , Instagram , And thats all but how can you spend so much time on 2apps ??? She likes texting , she doesnt sext or anything i know because every month i get all her text printed out , so can you say y she is useing her phone so much , and what apps does teen girls use Btw She is 15