“We find robust evidence that computer programming enthusiasts and illegal activity drive interest in bitcoin, and find limited or no support for political and investment motives.”

http://www.coindesk.com/google-search-study-hints-shady-truth-bitcoin-users/

“Our research finds that two Google search terms – related to computer programming enthusiasts and possible illegal activity (“Silk Road”) – are statistically related to search interest in bitcoin. With any search query, it is not possible to conclusively figure out the underlying motivations of the audience, or the exact composition of the audience," Yelowitz told CoinDesk.