Talk about coincidence

Tumblr is a network I visit about once or twice a month. I admire other people's ideas and share the upcycling stuff there; so, unless I have something new, I do not log in. Thus, I was quite flabbergasted yesterday seeing my very own work on the title page. That answers my question how they select the front pictures - they don't. They simply run a random generator, because my photograph was neither designed to work as a center piece nor does it do too well in that position. But hey, I was still thrilled of seeing it there!
Tumblr must have a mechanism in place how to sieve out the pictures with aggressive, insulting or otherwise unsuitable content. So, possibly, there is a person for final clearance.