In one of the psych classes I teach, I have my students engage in an observational activity where they observe their thoughts and feelings while on 3 different sites of their choosing. I suggest Facebook as one of the sites.
Interestingly, about 85% of the students associate the feelings of "hostility" and "irritation" with Facebook, even though they report liking Facebook and looking forward to going on it.
But when they actually do go on it for the activity, they report veering into negative feelings fairly quickly, about 85% of the time. And the words they use are, with great regularity, "hostility" and "irritation."
They report being surprised by how irritated and hostile they actually feel.
Interesting.