I was astonished when websites started asking for your login credentials for *other* websites in order to scrape your contact info.
The continued erosion of privacy is starting to look like the proverbial frog being boiled alive.
Google would love to have the Facebook and Linkedin social graphs. It seems credible that they would use your credentials to scrape your portion of the graph.
So I'm curious why you find the idea ridiculous. Do you not agree that Google desperately wants this data? Or do you think they have some ethical barrier to acquiring it?