It keeps track of the sites in memory. That means if the machine gets kicked, old urls can be submitted again.
It is also just simple URL based limitations, adding some bogus parameters to a url, or a hash, would be enough to get around it.
I don't know the specifics of the algo, but it may also add sites to its cache if someone visits one of the old comments pages, which could make it look more sporadic and picky.
It is also just simple URL based limitations, adding some bogus parameters to a url, or a hash, would be enough to get around it.
I don't know the specifics of the algo, but it may also add sites to its cache if someone visits one of the old comments pages, which could make it look more sporadic and picky.