PayPal is not the only organization that blocks Tor.

Matthew pumpkin at
Tue Aug 24 09:28:58 UTC 2010

On 23/08/10 23:21, Jonathan Lassoff wrote:
> On Mon, Aug 23, 2010 at 1:18 PM, Matthew<pumpkin at>  wrote:
>> It is also worth noting that Craigslist prevents the use of Tor albeit in a
>> very strange way.
>> If you try to post using Tor the ad will be permitted at first and people
>> can contact you.  However, after about 15 minutes (and it is always about 15
>> minutes) the post is "flagged" and disappears.  This happens even if the
>> exit node is in the same location as the section where you are trying to
>> place the ad e.g. using a Californian exit server and the ad is something to
>> do with California.
>> I can understand that every day or week the Craigslist system has a look at
>> the Tor exit nodes directory and therefore can identify Tor nodes.
>> What I fail to understand is why the Craigslist policy is to permit the
>> posting then "flag" it after 15 minutes or so?  Is this automatic?  Is it
>> human?  I find it bizarre.  What might be the reasons?
> That's interesting. I haven't tried this myself, but I would imagine
> it may have to do with the way that craigslist generates their pages.
> I could be very wrong, but I think that they're regularly generating
> static pages to be served rather than making them dynamically.
> For example, if you're searching for a popular term or watching a
> popular category, the page for a search only seems to get updated
> every 15 - 20 mins at which point several new entries will show up.
> Maybe posts created from tor exit nodes are flagged in this automatic
> page regeneration?
> expand slightly - they must have a stage-based process.  They 
post new pages every 10 minutes or so (so statically served) then check the 
IPs which posted all new ads every 20 minutes or so.
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