This won't work (Score 2, Interesting)

Firstly scraping is the same as what google does, which is fine but only a fool would trust the scraper not to censor their output.

Secondly, scraping doesn't always work and you will surely have low-grade porno and get rick quick schemes/scams littering your sematic data.

But let us suppose that the main benefits of a semantic web are (A) access to reference data [which may be falsified, oops], and (B) access to product availability data [which may be falsified, oops, like mail order companies that pretend they have something in stock but don't and yet still charge your credit card].

It's just won't work.

It will always be a rough approximation of reality.

It's just a way of bad way of caching the results of scraping.