title: Tracking parameters into eBay
body: <p>I have a shop on eBay and would like to measure how effective my Internet marketing is.
  Is it possible to pass parameters into eBay and then be able to use those values?</p>
  
  <p>For example a link from Twitter promoting an item might be
  <a href="http://www.ebay.co.uk/itm/widgets/123456789012?source=twitter" rel="nofollow noreferrer">http://www.ebay.co.uk/itm/widgets/123456789012?source=twitter</a></p>
  
  <p>I'm wondering if eBay have reserved parameters such as 'source' above that I could use.</p>
  
  <p>I also send out personalised emails to clients. I'd love to be able to track the source of the sale by splicing &amp; <code>source=value</code> onto a link in the email.</p>