Long ago Kyo and I had some discussions on ways to let users internally advertise and cross-promote their comics. At the time we were more focused on other parts of the site though so those things kind of got shelved, some sort of system for sharing comics you like with friends will likely exist at some point once we get around to re-doing user pages. I'll pester kyo about my author-group suggestion again.
My thing for now is that it is easy enough in the author info box to just add links to the comics you like or even add links on your comic page myself. I do not need some other feature to do what I can do easy enough.
EDIT: I have to say that in terms of cliquiness, this is probably the least cliquy and yet fairly social forum I have been on. I don't know that, that would change having subscriptions listed...but this is not that cliquy of a forum.