Make a web crawler that hits publicly traded tech companies careers page, once a day, and tracks how often their job listings change. Make a big line chart at the top of a landing page that compares the different companies job openings (by count), over time. Penalize listings that list/delete/re-list job openings to always make it seem like they are hiring. Maybe have a max time a job post can be open before it's no longer part of their count (3 months?)
What you'll end up showing is similar to this article: A lot of company's stock is evaluated on growth, and part of the growth estimation is based on how much they are hiring in this down market. Some companies know this, and are trying to game the system
Anyways, I bet a decent amount of people would watch that like a hawk, and the honest companies would love it because it would show how great they really are doing