As a member of that age cohort (but not a founder, much less one funded by YC), I feel qualified to speculate wildly about this! We were exactly the cohort who

As a member of that age cohort (but not a founder, much less one funded by YC), I feel qualified to speculate wildly about this! We were exactly the cohort who got facebook off the ground - I joined in March of '04, spring of my freshman year - so while we may not be "social web natives" depending on your interpretation of such a noxious term, we're definitely well-acquainted with it. Probably well enough acquainted to feel that we know what features are missing, what niches are underserved, or something along those lines, with existing social services.