Latest questions about "profile picture"

Can I see when a contact that blocked me on Viber changed his profile pic?

My friends can't see my Viber profile picture although I am in their Viber contacts list and chat with them daily. How can they see my profile picture even after refreshing their contacts?

I posted a picture on my Viber profile and then removed it, but still my friends who are in my contact list of Viber can find my removed profile picture.

One of my friends used to have a photo in Viber but the profile picture has since disappeared.

I am using Viber (ver. 4.1.1) on a Samsung S4 mini. I am a fairly expert user.

What software can I use to find pictures on the Internet that match a profile picture to see if the communication via social media is with a hacked or made up person or someone who has a real profile?