title: Can I store user ids with google analytics?
body: <p>I want to track how individual user navigate through a website. Using Google Analytics I can use custom variables so in theory I can use the user ids to track individual users. However, according to the <a href="http://www.google.com/analytics/terms/us.html" rel="nofollow">terms of service</a> of Google Analytics I can't use GA to <code>track, collect or upload any data that personally identifies an individual</code> (Section 7. privacy). Does a user id classifies as data that personally identifies an individual? I merely want to use it to link the data from Google Analytics with our own data.</p>