I can't see how public proxies would be unsafe for such a task whereas private proxies would cost you hundreds of dollars to generate decent traffic.
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here's an example for you - if he wants to generate fake traffic and having analytics or adsense on the site to fool G, it is very likely 90% of those public proxies are blacklisted by G and when it sees his traffic is all from blacklisted proxies guess what happens with his rankings..
Hmm... You may be right but then again I doubt a few hundred visits would do any harm to the rankings.
Google will probably be able to detect that the traffic is nonsense or the same person. Unless you change some other things, such as your browser, etc, Google will realize what your'e trying to do.
Is it safe to use public proxies when generating fake hits to your website, or should you use private proxies.
for traffic you can use without any kind of problem public free proxies ...
Public proxies are usually low quality. Go with private proxies.