Hedonometer

Measuring the average happiness on Twitter

Hedonometer.org is an instrument that measures the happiness of large populations in real time. The hedonometer is based on people’s online expressions, capitalizing on data-rich social media, and measures how people present themselves to the outside world.

Reviews
Discussion
This isn't really new, but it seems like something folks in the PH world would appreciate — especially as the world seems to grow darker by the day. =D
When choose full option it's creates a sinusoidal pattern. That's okey. Sometimes bad sometimes good. This is the life.
So Christmas IS the happiest time of the year!
This is really cool. You can also build your own version of this and customize it to maybe track your brand or something: https://github.com/machinebox/mood
Big fan of this. Fantastic.