Aren&#x27;t all utm_foo query-string parameters from Google Analytics (&quot;Urchin Traffic Monitor&quot;) tracking, and therefore not only safe but possibly an actively good idea to drop on a re-aggregator like Hacker News? If I see an article get tweeted and that URL includes ?utm_source=twitter, it doesn&#x27;t seem too useful to anyone for HN to keep that.<p><a href="https:&#x2F;&#x2F;support.google.com&#x2F;analytics&#x2F;answer&#x2F;1033867?hl=en" rel="nofollow">https:&#x2F;&#x2F;support.google.com&#x2F;analytics&#x2F;answer&#x2F;1033867?hl=en</a>