It's kind of hard to make sense of that graph without a vertical axis scale. I c...

aikah · on April 15, 2015

https://www.google.com/trends/explore#q=foursquare

It's a "relative" scale. It's the difference between the highest point and the lowest point. The highest point being when Obama checked in on Foursquare. The lowest being ,well, when Foursquare started.

comboy · on April 15, 2015

Exactly. Without Y axis it could have just as well dropped 1%.

It seems to be a screenshot from google trends though, so it starts at 0 - http://www.google.com/trends/explore#q=foursquare