my feed is definitely still a ghost town...i think all the tech savvy people i know kind of gave up on it and people like my parents and in-laws etc are not likely to ever join.
YMMV. I'm definitely not in a ghost town over there. People like Andrea Kuszewski do a lot to generate high-quality content, and keep the conversation going. While my Facebook is more active, sure, my G+ account is where things I care about are happening.