A gravatar, or globally recognized avatar, is quite simply an image that follows you from site to site appearing beside your name when you do things. Avatars help identify your posts on blogs and web forums, so why not on any site?
Google allows four different dynamic URL parameters to be added to any AdWords destination URL string to pass along information about that particular click. These parameters are replaced with actual data about the click so that your log files, or tracking system, contains additional data about your AdWords clicks enabling one to analyze more data about any campaign and individual click.
The four parameters pass along:
* If the click originated from search or the content network
* The keyword in your account that triggered the ad that was clicked
* The creative that was clicked
* The originating website (for Site Targeted campaigns)
YSlow analyzes web pages and tells you why they're slow based on the rules for high performance web sites. YSlow is a Firefox add-on integrated with the popular Firebug web development tool. YSlow gives you:
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