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Why is flash bad for SEO?

Flash is dependent on browser plugins to work properly. When search engines crawl your website they don't have these plugins.  They see your website in a text only fashion.  Since search engines can't read flash content, they need some sort of alternative content available. When building flash based websites its important to include some sort of browser detection, and always have a non flash version of your content so search engines can crawl your website.  Developing websites that will support dual formats ( flash and non flash ) is a very time consuming, and expensive process. Unfortunately there are many developers who neglect SEO and develop Flash only websites.  This will look great to viewers but your website will often not be found on search engines.  When using Flash we highly recommend using alternative HTML content to make the search engine crawlers happy.

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