Mostly they end up across a variety of clients in my Mac and as I use spotlight and notice them in emails/messages add them where needed. Not ideal, but I have

Mostly they end up across a variety of clients in my Mac and as I use spotlight and notice them in emails/messages add them where needed. Not ideal, but I haven't put much thought into it. Email/cell/IM/linked in contacts come in where they will. I prefer something algorithmic like Spotlight to surface them for me in near term searches...