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We have never had any negative SEO effects from this. Just make sure you handle it the correct way - its a bit more than just uploading a ttf file. Use either Google fonts or a create your own "kit" with font squirrel which converts your font to all of the necessary files and gives you the sample css and html codes to implement it correctly. Here are a few resources: @font-face generator: http://www.fontsquirrel.com/fontface/generator Google Fonts: http://www.google.com/webfonts