SEO is non-deterministic enough that I hesitate to even speculate, but the clean markup on sites like eFreedom is probably a lot of their advantage. Stack Over

SEO is non-deterministic enough that I hesitate to even speculate, but the clean markup on sites like eFreedom is probably a lot of their advantage. Stack Overflow buries its content in quite a bit of presentational markup. Everything else being equal, it makes sense that the tighter, more focused page should rank better than the larger, more convoluted page containing the same content.