Of course in the case of LJ that would be Dreamwidth, and speaking of that, i've still done almost nothing with my DW account. One of these days i ought to get around to importing all my posts over. And what's that tool i see people using for crossposting to LJ and DW at the same time?
But anyways, i ought to check out the Google+ thing at some point, but after the experience i had with Buzz and my Google Profile i'm rather suspicious of their promises about privacy. I've actually got a number of gmail/google accounts now because Google pissed me off so much, but even if i use one of the alternates, if all my friends use profiles with their real names and i link to them then it would be pretty trivial for people to figure out what's going on.