I wrote this in a previous HN post that talked about Facebook. I sit on the opposite side of the scale: My Facebook account is quite nice; I've got friends from all over the world (I've lived in 7 different cities throughout Europe and the Americas in my 40 years of life) and my Facebook feed/network makes it possible for me to see where are they now, what are they up to, and when one of them has a kid in Serbia, or another has some milestone in Chicago I get to cheer them. The last post was about a cousin that just had his first solo airplane flight! I haven't seen him in like 5 years, but still it is nice to tell him "wow, that's great!".
When people say that their Facebook stream is "very angry", it seems to me that it is mainly a reflection of the network that they happen to be part of.