eg. #cdnpoli on my current GNUsocial instance https://gs.jonkman.ca/tag/cdnpoli and on an older instance http://s.russwurm.org/tag/cdnpoli or even a foreign site like https://gnusocial.de/tag/cdnpoli -- this actually illustrates the problem with #hashtags; they only propagate to instances where someone is subscribed to the person posting. A !grouptag will go to all instances where anyone has subscribed to the !grouptag, whether they're subscribed to the person posting or not.