Ew, how unimaginative. I think it's probably more clever to exploit the fact that people are associating sites with each other - if someone is interested in one, they'd be interested in the others. Maybe start a web search?
And/Or, this would be a very useful way of using humans to relate URLs to each other with an explanation of what the relation is. I'm not well-versed on the current state of AI but I think this sort of activity is still something that is too complex to get computers to do well and efficiently.
