Behaving in that pattern in a conditioned sense opens oneself up for all sorts of manipulation, which long term, that's quite a bit of suffering (if there's no genuine connection between members of a social group, hence, the group is prone to rapid shifts in likes/dislikes'. It becomes hard to determine intent - which makes the social environment untrustworthy, which in my opinion, is the basis of what is required for sanity. Trust. You can have that as something established over a long time, or you can have instant connection, just really 'get' someone and where they are coming from.
Facebook is an addiction. There's plenty of places on the internet that encourage healthy dialogue and it's obvious / quite plain to see what is effective and what is ultimately destructive.
I like HN a lot. So many other places on the internet, it seems like a popularity contest. Here I can get 0 or 1 upvotes but not feel ignored, not feel worse off for it.
Healing, in many regards.