Facebook has been emotionally manipulating you. On purpose.
In essence, Facebook purposely manipulated the data to toy with your emotions. The results were published in the following article: Experimental evidence of massive-scale emotional contagion through social networks
Basically the above article states the following:
We show, via a massive (N = 689,003) experiment on Facebook, that emotional states can be transferred to others via emotional contagion, leading people to experience the same emotions without their awareness.
Technically, Facebook has every legal right to do this since psychological research is covered within the scope of their Data Use Policy:
For internal operations, including troubleshooting, data analysis, testing, research and service improvement.
As interesting as the article is… I can’t help but feel creeped out. It is important to always read the fine print. And this above all… when it comes to social networking, you’re not the customer – you’re the product being sold.