I don't understand the benefits we can gain from keeping the contact list. No picture sharing. No personal details sharing. At least why we can not see the big version of the profile picture of our friends?
I suggest you to open some facility to chat among friends with sharing pictures & greetings easily. And also some special emoticons only to share among contact list.
It will be also worth if we can maintain picture albums to share with friends- if so we need not to use our emails