Should I be a little more public with my life?

I’ve had a hard time making friends since I moved to the city I’m living in now 3 years ago. I never had trouble before in the other cities I’ve lived in.
Discussing this and a couple of things I’ve heard with my sister, she mentioned that I don’t really post much about myself on Facebook, which is what all the cool kids are doing nowadays. I don’t check in anywhere, I don’t post pictures of anything I’m doing, and most of my status updates are snide remarks or nifty links.

So if I start smattering my Facebook with pictures or talking about what I’m doing at the moment, do you think it will throw up a flag that says “Hey, this is how I do!”, or would it just be obnoxious prattle? Has this kind of thing worked for you?