The pictures are hosted on sites such as flickr. Various content filters (websense, barracuda, ironport, squid) categorize these sites as hobbies, photography, content sharing, etc.
Companies with aggressive policies towards "productivity" block these sites by category.
In any event, I travel between various client sites and a small number of them block most of the images on Canreef. The one site that comes to mind runs a squid proxy server. I'm not sure the admin is intentionally blocking the images, but all that displays is a little red X where the pictures should be.
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