I have a project I have been working on since the 90s... I know not everyone uses FaceBook but I'm just a guy with way too much stuff on this project going on to use any other web presence. I focus on the project but do at least have A web presence.
I call it The Collector Suite. I am a card collector of over 40 years. I needed a real resource for knowing what my cards are worth. I also needed a way to validate my insurance coverages. I also collect toys, comics and antiques...
So, I created a software suite that would accommodate these needs. Each sport of cards is a plug in for the users version of the suite. The other items I mentioned above can also have databases, a unique editor and be fully integrated with any other plug in collectible.
Item numbers will be unique to each card tracked in the Suite, every user who uses the Suite will be using the same item number, allow full connectivity between what you want & what is available.
So for your consideration & review... The Collector Suite
https://www.facebook.com/CollectorSuite/
Extended Demo Video
https://www.youtube.com/watch?v=0UxbHbHzj3I&t=91s