As other have said, my experience with Facebook just doesn't mirror the "angryness" and hatred that other people are seeing. My Facebook stream is just every day things from friends I have made through the world. It is very useful for me to maintain a bit of a touch with people I esteem so much but with whom I've list touch through the years.
The "angry facebook" experience to me seems like the moms against heavy metal / twisted sister case: People are seeing a reflection of what their peers share.
If their circles are angry and share disinformation, that's what they will see.
I've also never had an issue with Facebook. I've been online through usenet/irc, AIM, livejournal, and then forced to join Facebook because everyone at the university was using it for class correspondence. Later, I have exactly your sentiments, that it has allowed me to stay in touch with people I would have lost touch with over the years. I take advantage of some of the groups for my industry, and my hobbies. I use our company's Page to interact with a whole segment of our international customer base, that would never think to call our support telephone number or e-mail. It's never been a negative experience for me. Although I only look at it when I get home from work at night on my desktop computer. And don't ride around all day with the app running in my pocket. I don't quite know if that would make a huge difference though.
The "angry facebook" experience to me seems like the moms against heavy metal / twisted sister case: People are seeing a reflection of what their peers share.
If their circles are angry and share disinformation, that's what they will see.