I am a heavy FB user/frequently depressed person. I wanted to show my agreement with something stronger than an upvote. Depression -> distraction-seeking -> FB wall would be the link for me too.
I want to chime in and also show my agreement with that statement. I've observed from my own deppressive behaviour that Facebook is just one of many go-to things. For instance, when I found an interesting show I haven't watched, I wouldn't even think of browsing Facebook (or HN) - I'd shift between my job and watching the series.