I work in theatrical marketing, but we use a really stupid ticketing platform that doesn't allow me to place a tracking pixel on our ticketing pages. (Bit of code that helps track from when someone clicks on something online and follows through to eventually buy a ticket.) Super duper valuable for being able to say whether or not your online advertising is having a positive return on your investment. One of the BIGGEST BENEFITS of digital advertising is SUPPOSED to be that you can track EXACTLY how much money you're making off of it. The fact that I can't do this right now (without upgrading to the newest version of the ticketing platform for, you know, around $40k) is MADDENING. We're likely going to switch our ticketing platform after next season, at which point that issue will be FIXED, but for now I'm having to work around it.
Facebook has an option to let you basically upload purchase data and they do their best to match it to people who have seen or interacted with your ads. For the first couple weeks I started uploading data, it didn't match to any events on their end. But in recent weeks, it's finally starting to populate, and I can now give ACTUAL CONVERSION NUMBERS on some of these ads. It probably sounds dumb, but this is SUPER DUPER EXCITING for a marketer.