Yes, you then have the same problem suffered by most social networks. I actually think a similar problem has been partially solved by Twitter already. Twitter

Yes, you then have the same problem suffered by most social networks. I actually think a similar problem has been partially solved by Twitter already. Twitter grows but the content curation is done by the people you follow therefore new users don't affect your interactions on the site unless you let them. Of course, there's gardening work which has to be done by the user in getting to this point but it would probably be less work than browsing some of Google's search results. Additionally the intelligent thing would be to mine the social interactions of authoritative users to provide public data for users that don't want to engage with the app. edit: Of course, it's possible to become an authoritative spammer in which case as a power user you will still need to garden the group of users that you interact with.