Hi, I'm Prem and I have extensive knowledge in web scraping with Ruby. I have scraped Amazon, Willow,Yell, Yellowpages and few other sites. Search engines check from all parts of the page. So I would suggest first lets search for the keyword in google and get list of sites and for each sites we will read them and check whether the keyword is present in their meta tags or header. I can get this as a Rails app for you. Let me know if you would be interested. Thanks