I have been experimenting with Google Trends a lot after reading the book " In the Plex". Its awesome what you can extract with google. for e.g here is a sentiment indicator that i have derived from the search volume data available on google trends and it tells you a story. The data ranges from 2012 to 2017.
Anything below 100 is fear and anything above 250 ish is approaching greed with 300+ being “rulayega kya”. These are levels that i have eyeballed and decided as thresholds but they certainly mirror greed and fear in my opinion. Please note that all this data is based on search volume and not on financial prices or any derivative of it. I find it very very cool. Please add to this if you find it useful and maybe you can extract your own stuff from google and post it here for the benefit of the rest of the community