Rated 5 out of 5 stars

I've only played around with this for a few minutes so I can't speak to stability yet but at first glance this is excellent. I'd go so far as to recommend this replace the default Thunderbird address book. I was using AddressBook Tab but think this is going to replace it!

I appreciate some neat features like Mail Popularity (similar to XOBNI's feature) and Categories (great batching feature!).

I found this plugin looking for some way to link related contacts similar to the way Outlook does. Categories does the trick! And it appears you can edit contacts in CB independent of TB's address book.

Will social media links for contacts be added soon?

This review is for a previous version of the add-on (21.5). 

Will social media links for contacts be added soon?
--> it's already possible to have direct phone calls or direct jabber. for this in CardBook preferences, check the tab "Internet Communications" (fourth tab)... hope to have correctly understood :O)