I enjoyed the Twitter coverage very much. It felt like seeing a little bit of the future.

In addition to datetime (or perhaps instead of datetime), you could use an MD5 of the file's contents. I can imagine that an attacker might be able to munge out a datetime, but they'd have to hack your plugin specifically to cover their tracks there.

Hi, Lisa. In the software development industry (particularly in my little clique) there's a model called the Dreyfus model of skills acquisition that might make you feel more comfortable about classifying yourself. If that's what you're into.