I totally agree. I used to post status updates of some milestone in my life in the night, and eagerly anticipate the large # of responses the next day.. when it turned out to be just 1 response (from a friend I haven't even met), or 0 responses, I'd become a bit jaded.. then bitter and angry. I realized how unhealthy this was, and just quit FB afterwards... I also realized most people won't really identify with your milestones because they have no idea how hard you worked (such as announcing your startup launch).
It's a relief sometimes because the truth is noone really is thinking about you, so don't worry about feeling embarassed or worrying about what others think.. 99% of their mindshare is preoccupied with themselves: getting richer, getting laid more, etc.
It's not FB's fault but the whole structure of FB does exasperate these feelings of jealousy, and narcissism.