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Siple URl will always helps in Getting good SERP in Search engines.
Also dynamic using dynamic url's in websites is a bad seo peractice.we should try to minimize these dynamic urls in website
Video file in your webpage can make a huge difference in your website. Although the Video files are present in very small percentage as compared to images and text. As these files consume a large amount of bandwidth.
If you want to insert video files on your web pages in order to be played by...
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Do follow list of social bokmarking website..
Another list which i know , has listed do follow social bookmarking websites is here...
List of DoFollow Social Bookmarking Sites | Earn Money on the Internet - Earn Money Online