I Think this is the best app for messaging.
We can post videos, picture in our status and we can see our friends status . If I want to wish a birthday to my friend in midnight and his/her phone was not reachable then I will post a beautiful text and picture of him/her and post it to my status and he/she will definitely see it because if there is noone online then there is ine thing to do in WhatsApp and that is checking status of friends and family and there he/she will see it.
It is safer than Facebook.
I am using this app since I have smartphone and I doesn't see any issues in it .
It is just wow.