Several (most) of the photos I have on this site are actually hosted on Flickr. If they are missing, today (July 25th, 2013 7pm to 1am), then the below is why.
We wanted to give you a heads up that Flickr will be undergoing planned maintenance this coming Thursday, July 25, from 4pm to 10pm PDT.
During this time, Flickr will be unavailable on web and mobile, and the API will not be reachable. There will also be a site-wide notice an hour beforehand to make sure no one is taken by surprise.
To stay on top of our updates during the outage, follow us on Twitter.
Thank you in advance for your understanding.