Algorithm or formula to measure happiness? I am working on a project that takes in comments in a given Facebook page and determines the average happiness rating for it based on users of the page. My question is where would I find a formula, rating, or any other literature that would help me find a way to measure happiness using words and collections of words?

I'm looking for something similar to cosine similarity I suppose, but not to find similar words, but to find the average positivity or happiness related to a word or collection of words.

I'm not entirely sure this is the correct place for this question, but it has to do with data, and big data within Facebook so I am hoping to either get a question or be directed to somewhere that I may be able to find my answer. Thanks in advance for your help.
You should be looking towards Natural Language Processing, specifically at Sentiment Analysis.  

The link I provided is a good starting point for learning about sentiment analysis.  If this is what you are looking for, it is available as part of Stanford's Core NLP.