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For example - my referral logs are completely littered with sites such as (I am making these up but they may be real sites)
and on and on all of which send between 1 and 15 visitors (most of them 1-5).
Are you guys seeing the same thing?
[sorry for the misspelling of the title, only caught the afterwards]
I just tested a product called Who's Clicking Who and it shows the majority of clicks were from an AOL proxy. Apparently this is because AOL is a really big partner with Google.
There were also a lot of repeat clicks that looked like they were just visitors that went wild with the clicks (4 or 5 clicks). Some of the others clicked a couple of times and skip a day and click a few more times, this was the activity I was looking for and found only a few.
I only advertise in the US and I use negative keywords like "India" and "Russia" to hopefully keep them from seeing my ads. If you are advertising worldwide you may have a bigger problem. Then I would recommend getting software like Who's Clicking Who for a while to see exactly what is happening.
With that in mind I set up a huge list of negative keywords (Like -keyword) and made sure "India", "Russia" and a lot of other words like "free", were among them.
When you go into your campaign you will see a place to add negative keywords or you can add them like regular keywords with a "-" in front of the word. I found out that I've been spending way too much on searches that don't pertain to what I sell. Negative keywords are used mostly for the broad match.
I also turned off the content network in the section where you edit your campaign. After doing this I noticed a huge increase in my CTR and I think it got rid of some of the click fraud. The content network is something that I will have to do more testing on later.