[obrero]

When I went into Facebook's bathroom, at eye level over each urinal was posted a weekly newsletter, which talked about changes to their PHP API.

[teen]

haha for some reason, i love this idea

[boulos]

The first instance of this I saw was "Testing on the Toilet" which started at Google in... June? July? 2006.

Still going strong, though depending on the office and particular bathroom distribution seems to have problems at times.