Mashable‘s post ”Starbucks Cards Can Now be Managed via Facebook” is worth reading but what I really noticed was that it was shared on Facebook nearly 4 times more than it was re-tweeted, and nearly 200 times more than it was Buzzed on Google.
That surprised me, the effort of doing any of them is about the same. I would have always thought that Retweets were where gravity took the “instant sharer“, but no.
Why not? Not sure, but perhaps because people feel that their network quality is now better on Facebook?