Google Plus: The problem isn’t design, it’s a lack of demand — Tech News and Analysis
"Whenever I use Google+, I feel like I am doing Google a favor" @mathewi on G+ http://t.co/aBca7Js8
"And unfortunately, people don’t submit information to social networks because they love data set integrity or altruistically believe in giving as much as possible. They do it because the act of contribution selfishly results in something for them in return."
And I guess Plancast did not give enough in return.