Hmmmm I think they're almost as bad as each other -- with Kred being my least favourite for thinking it could join the party so unimaginatively and cynically that far in. More of a personal dislike of it though I guess.
Good point Max. Bing and Klout though, seriously? I think that we are still in a world with too many social solution sellers peddling 'snake-oil'. Great concept, but nothing that still quantifies influence in it's true sense. Somehow and for what it's worth I do think that Google's moves are interesting and under the radar with regards to AuthorRank. It's a case of slowly, but surely IMO. :)
Cheers for the tips +Donald Strachan -- and yeah, the bizarre thing about G+ is the company keeps telling people it's not as simple as a Facebook emulator but people just take that as making excuses rather than listening.
Fascinating stuff and I hope evidence like this starts to turn a few lore heads...