Joining a new social network means I have to wait for all my friends and "friends" to show up in this new place, invite them to my circles or whatever (and thereafter attend to the inevitable "will they or won't they accept?" dramas that ensue), establish my security settings, upload my pictures (but surely not those pictures), alter my security settings, enumerate all my interests, affiliations, and loyalties so as to be fed the proper set of advertisements, re-work my security settings once more, touch up my profile so that I present a slightly interesting version of myself -- a tiresome feat in itself -- make some additional tweaks to my security settings, link the Google Plus account to all the proper feeds to and from Twitter and Facebook and whatever else, enable these but not those applications, applets, gadgets, add-ins, widgets ad infinitum, and embark on a final and never-ending course of refinements to my goddamn security settings.
As I said, it's exhausting, and while I have mostly warm feelings about google, and at best lukewarm feelings about Facebook, I will need to see something truly compelling before I go to the effort of abandoning the latter and moving to the former. A one-click "upload everything from Facebook to Google Plus and then delete Facebook account" utility would be a good start, assuming it didn't steal my identity in the process. It probably would steal my identity, or threaten to, whereupon I would need to update all my security settings again. Exhausting.