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Re: [tor-talk] Yelp blocking Tor users from viewing entire site

On 01/21/2015 05:04, Aymeric Vitte wrote:
If they cannot detect a crawler using Tor, then they cannot detect any other crawler, like a crawler switching IPs as mentionned in another post, using vpns or proxies, etc

So in that case it's useless to block Tor, because Tor network's size is not really significant compared to other means that crawlers have, probably they just choosed the easy way as well as crawlers might have chosen the easy way too (use Tor), blocking Tor so they have solved one problem.

But in fact they have solved nothing if they are not protected against crawlers, and if they are protected the protection would be something like blocking the IP or sending a captcha.

One other thing they try to protect from is people writing reviews for their own businesses. If someone logs into Yelp as the business owner and as a reviewer from the same IP, they would make such review "not recommended" (previously they made it "hidden" and protected with captcha). And possibly flag the whole business as suspect for writing false reviews. Yelp also sends businesses monthly reports on how many people viewed their Yelp listings and from which geographic areas. Tor defeats such detection schemes, therefore they decided to block it to simplify their guessing and reporting work.

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