It all started when Carmen asked me (something like): "couldn't you play that music from Murder She Wrote at work whenever you're typing?" Given I was on a plane at the time, with nothing much else to do, why not think about it?

Go to any local attraction and you'll see people taking selfies with statues, towers, all sorts of sights. Once, walking past tourists taking pictures of Greyfriars Bobby in Edinburgh, I reckoned that some of those will be posted on Twitter. I should be able to find these, and similar pictures, automatically. How difficult could it be?

Problem: Porn.

I am an occasional photographer and I became interested in how compositional techniques could help me produce better pictures. I've been using the rule of thirds, not least because my camera has an easy to use overlay for it. However, what