Hey there everyone. I have a blog that has been 100% XHTML valid according to the W3 Validator. However yesterday I installed a social bookmarking plug-in that I thought would be very useful to have. Now when I checked if the XHTML was valid I saw that the plugin gives some errors and warnings. So my question is: Will this affect my SEO? Because I really want the plugin but I also want the site to be valid. The link to my website is in the description. The plug-in is the social bookmarking icons to the left of the site.