[foldingmoney]

>This is showing "Pinterest the social network" not just "Pinterest the search term"

I believe this is just a broader result set that includes searches for anything that Google deems to be related to 'Pinterest the social network'.

Google doesn't have access to internal Pinterest metrics.

[zrobotics]

Google also knows how many Android users search/download the app. I don't use pinterest, but if they use Google analytics or ads then Google also has a fair amount of data on usage.

Google is very much a panopticon, I doubt any other single entity has as much knowledge of the internet as a whole. Now whether this reflects in Google analytics I don't know, as I've never really used their analytics for anything serious.