Most of my friends on FB are from college (when FB first launched), and most of them still live on the East Coast. Since I moved to SV, I have not added many new friends on FB (mostly because most SV-type people are not prone to use it that much).
So, when I launch my FB news feed, I am bombarded by news and stories and pictures from friends of old that I haven't kept up with, and I start to feel sadness and regret. I usually last about two minutes before I close the tab. I visit maybe once a week. =/