My problem with all these social networks is getting the family on board. I'm still waiting for a mature product that I can be confident about sharing with the

My problem with all these social networks is getting the family on board. I'm still waiting for a mature product that I can be confident about sharing with them - G+ is there, but not really anything else. I don't want to get +20 people onto a site only to have it go "sorry, we're shutting down", or "yay, we've been acquired, sorry early adopters" in a year. I've been burnt before, and I hate it when it happens.