To be fair, rowing doesn't have the biggest audience in the world. Neither does technical news (a la Digg and Reddit). Assuming you pick something hugely popu

To be fair, rowing doesn't have the biggest audience in the world. Neither does technical news (a la Digg and Reddit). Assuming you pick something hugely popular and you're the best (Godin suggests you'd also be the only) aggregator on the web, you're going to have some serious traffic. The presidential campaign videos has one such huge audience. Another might be following a professional sports league or tracking music videos within a genre.