Nice tip from Scott Buscemi on the Luminary Web Strategies blog:
Have you ever logged into Google Analytics and noticed a huge, unexpected spike in traffic to your site? Maybe your last blog post was shared by a huge influencer on Twitter — or maybe you’re the victim of referral spam.
One simple click. Be warned, though, you may be humbled by how much real traffic your site is getting with all of the junk removed. However, it will be a far more accurate picture of how many real people are visiting.