Seems like PBP's official tracking website is now running:
https://track.rtrt.me/e/PBP-2019#
And here's my tracking info:
https://track.rtrt.me/e/PBP-2019#/tracker/RU5ML3SW
Edit: seems like you can share multiple participants with a comma-separated list of hash tags in the link. In the URL above, for example, my hash tag is RU5ML3SW. So if you want to track multiples, you'd add more hash tags with a comma in between each one.