The general format for feeds to subscribe to is
https://hypothes.is/stream.atom?user=XYZ. As an example my personal feed is at https://hypothes.is/stream.atom?user=chrisaldrich. Some of my other favorites are judell, actualham, nateangell, mpelzel, mrkrndvs, jgmac1106, and jeremydean.
(By the way, you can do a similar thing for tag topics like:
I wish that the system had some more social features to make discovery and following of friends and colleagues easier, but doing it the hard way sort of makes it that much more valuable.
Who are you following there? Which other interesting Hypothes.is users should I be following? Do let me know.