Want to browse Pinterest? Open the app. Want to get Pinterest? Go to the App Store. Heard someone say 'pinterest' but don't know what it means? Search google.
Your link is only showing that last one.
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.
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.
Google Trends can't reliably tell you anything useful about a site's growth or activity. I'm not denying it correlates with your specific app, but that doesn't mean it will work for everything, and it clearly works very poorly for popular services.
Remember when everyone was sharing youtube videos. Or when you would sit and endless watch. I feel like that faded about 45%.
Google dropping makes sense. I visit less sites and the search results are not that great for discovery. Most sites I visit by typing a letter in the browser and auto completing.
Facebooks earnings raising 20% makes sense as more people are advertising on it. I notice 71% less people less original activity.. photos/status updates more groups/ads filling the gap. I spent 71% less time on and reduced my daily visits.
We're always chasing yesterday's tail. I bet twitter's numbers are down.
