I went to open facebook today only to see that the icon has disappeared. I am able to search for the app and find it but I have no idea where on the device it is located. I would like for it to be on my desktop. As of now, I have to search for it every time I want to use it. I've never had a problem prior to this. I didn't update any OS...it just happened on its own. Any ideas on how to fix this?