Beware and try avoiding this. If Google caught you, they will give a warning but sometimes they don't, so here are the ways Google detects invalid clicks.
1. IP AddressThis is the easiest to be recognized. If you are clicking ads that originated from the same IP address then Google will flag your account. Only stupid publishers will do this, because it is the most obvious way to get caught cheating.
2. Click Through Rate ( CTR )Usually, Click through rate does not exceed 10%. If it does exceed, then the red flag is on you. Having higher that 10% is very suspicious for Google.
3. CookiesNo, this is not the crunchy biscuits. In the old days, we have this Blast Internet card, it is a dial up Internet connection and has no static IP address, you just connect and disconnect you can have a new IP address. If you plan on doing this, think again. Google has set cookies on your computer. They can trace these cookies and see whether they originate from the same computer.
4. Physical Location
Google is really good at tracing invalid clicks, even if you try switching from one computer cafe to another they will still caught you cheating. They are good with tracing traffic origins even if you live in a small town. Google has a very good tracing software and technology.
5. Click PatternThese are some of the click patters that most cheaters do.
- Click and run. These are the clickers that click on your ads then run away, this are suspicious because most visitors or readers doesn't visit your site to click ads, they usually stay and surf for a while
- If the clicker is keep on clicking the same website with the same ads but never clicked on other advertisements.
6. Suspicious Search Engine Ranking
If this website is not indexed by search engines, has no backlinks on any prominent sites, but consistently get high traffic, then it must be suspicious and Google will smell a rat on these sites. Usually this is operated by clicking syndicates operating from third world countries. Their job is to click on ads to a specific site.
7. Web design
Those sites using "click this" on their advertisements are against Google's TOS. If you want to publish ads you should not lure visitors into clicking your own ads.