There is evidence for this as well: https://www.vice.com/en_us/article/mgbg7p/nsa-chilling-effect https://www.vice.com/en_us/article/mgbg7p/nsa-chilling-effec..

There is evidence for this as well: https://www.vice.com/en_us/article/mgbg7p/nsa-chilling-effect https://www.vice.com/en_us/article/mgbg7p/nsa-chilling-effec... People have changed what they search for since the Snowden whistleblowing.