I run a newsletter company with almost 500k subscribers. When I started out 10 years ago, I was a fan of Google Analytics so added these parameters to all links in my newsletters. This was uncommon at the time and it turned out to have a huge impact on our growth as lots of webmasters were glued to their analytics at the time, wondered who we were, and Googled the name of our newsletters! I got emails or tweets every week saying as much and thanking us for linking to them, etc.<p>In the last five years it hasn't come up at all as everyone is doing it and people seem to dig through their analytics less than ever before, but if it helps you track links to <i>your own</i> content, as being shown in the article, it's certainly worth a go.<p>Another amusing point is that HN didn't used to strip these parameters, so sometimes I could see when people had reposted things from our newsletters on to HN (and kept the utm params in) which was always a buzz :-)