How to find Businesses with Facebook Pages ?

I want to scrape businesses in the UK, preferably in my local city (London) that have facebook pages or twitter profiles. I have a product for online social network profiles, but I am unsure about how to find the relevant businesses that have online pages.

Any help appreciated.

Of course you could always just manually check them, or you could do a search term like

london business "Find us on facebook"

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For example, the first result from that search is this website: http://www.facebook.com/pages/BeautyServices4ucouk/106233832767200

Another search term that came up with plenty of results was:

"London, ON" "Find us on facebook" site:facebook.com

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What's the product?