CloudSend are whatsapp apps That is used for sending any type of file through any messenger but it is used extensively for android.But for this app to work You need to have dropbox installed on your android.the link of both the apps are given below just download...

Ya its possible!!.but only on your own phone so you can troll them by using it. This is how you do it -Step 1. Choose a picture for your friend which you want to replace with your friend profile pic and download it. -Step2. Now Rename the Image with your Friends...