I think more social networks need to gently enforce this kind of atmosphere—where it’s about the tribe, not the individual (and not the individual’s marketing copy). I would join those networks. I would love to make new friends… this way.
Self-promotion is great. Be proud of yourself, be proud of what you do. But don’t engage in it to the exclusion of people. There are amazing people out there, people you can connect with, people whose effect on your life might be amazing. People you could really help. If you swan around wondering what everyone else can do for you, you might never find them.