I blocked someone on all applications Whatsapp, Facebook and Instagram from 2 weeks, his number is still in my contacts. I have Snapchat but i dont use it so when i open Snapchat i can see his name and add icon next to it and that means he have Snapchat also but he is not my friend on Snapchat. So i get a notifications from Snapchat from few days that (he is on Snapchat) even though he already has it and this is the first time i get this notification . And why did i get this notification only from him and didn't not from other contacts?