Thousands of visits a day from untraceable traffic to website - Serious issue

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http://serverfault.com – At the end of January we noticed a spike in traffic to what JetPack stats says was home/archive page and what Google was classifying as going to /gaming/ which is an archive list in WordPress. This started off as ~3,000 unique visitors and jumped up to 65,000 unique visitors in one day, again all to the "home" page. This happened over a course of a couple of weeks and we thought we were getting attacked. The traffic then dropped off for a few days but then came back but came back as only about ~15,000 uniques a day and has been like that every day since. We came to the conclusion that someth (HowTos)