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I find it depends on your content, if you have words on your site that relate to what people are asking about, then it will find your page. I've had forum threads show up at the top of google searches because it's something that fits the search. I don't think meta tags are enough because, related sites to mine use the exact same meta tags I do. So that's competition in the rankings. If you put actual content that relates to the what people are looking for, then you move up higher in the google searches.