I was trying to validate the facebook like button yesterday. After writing over 30 lines of code I found J. Norton like button script, which is quite lighter. So I spent nearly half an hour trying to integrate it in to my template and 3 hours to create this valid facebook like button generator so you can make it as you desire and should still be W3C valid.
The facebook like button enable your users the possibility to share your content on facebook so that their friends could see it. So what are you waiting for, go ahead and create you own valid facebook like button.
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To get your Facebook Application ID for your like button you have to go to Facebook Developer Page and sing up. You must set up a new application if you don't have one. Otherwise just copy and paste your App ID in to the "Facebook Application ID" field down here.
Please comment if you need further assistance