I learned today that SonicWall filters MemeStreams under the category "Hacking/Proxy Avoidance." While these are certainly topics that have been discussed here, Slashdot is not banned under this category, nor is Security Focus, from which live exploits can be downloaded for most disclosed vulnerabilities.

BlueCoat also filters MemeStreams as "unavailable;Hacking;Forum/Bulletin Boards." I have no idea what "unavailable" means. I agree with the "Forum/Bulletin Board" categorization, but again the "Hacking" category raises questions. It only makes sense if its applied consistently. I don't have access to a BlueCoat proxy to check.

Have you seen MemeStreams banned by a web filter? Do you know the vendor and category?