More + More = Convenience?

Google + ... another social media venue. So, with mild prompting from my techie husband, I accepted my invite and joined yet another online network. I have no friends (On Google +, I mean). Apparently, the only way you may invite people is by selecting someone from your gmail contact list. I have a gmail account, but I do not have a contact list. Personally I feel a contact list is redundant. If I need to contact someone via email, I locate the last correspondence in my inbox and reply. Simple. My successful system has worked thus far, but now I have no friends, which I am quite alright with accepting. In fact, it may be safe to say I am near being teched-out (if such a thing exists).