I've noticed that in the native Google IM app some of my contacts don't have an avatar picture. Most all of these have an icon avatar in my contact book. I've looked around the settings and can't seem to find a way to manually add one myself. Does the contact have to upload an avatar on their end or am I just not seeing where it is? Hopefully it's the latter because there's a good chance most of my contacts w/o one will never add one on their own.