Why is flash bad for SEO?
Flash is dependent on browser plug-ins to work properly. When search engines
crawl your website they don't have these plug-ins. 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 it is 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 search engine crawling possible.