This came up as a comment. It seems Flickr staff claims it can't block IP level. If this is true, which it certainly is not, Flickr is wide open to DOS attacks. Having a major global web site unable to block IP would be like a Hackers dream, read for yourself, but it sounds more like either heather does not understand what she is talking about or just making an excuse for not doing anything to protect users from criminal attacks. It simply can not be true, the firewalls must be able to stop IP that are sources of attacks.
There are also over 2 million links on Google to Yahoo IP blocking, so the technology is certainly there. My own testing indictes that flickr admins can block ips to forums.
So the question is why did heather lie.
Eudaemonian, I'm sorry that we haven't gotten back to you in a timelymanner. We've been reviewing the case and instances such as these it'sa bit of a quandry, given that we can't block individuals at the IPlevel
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