2018-11-16 UTC
# 
[tantek] summary: if you have a hashtag UI (e.g. enter hashtags directly in text in your post like you would on Twitter, IG, etc.), then use _ when you mean a space. If you actually mean _ then use __. Then in your markup, use abbr to markup the p-category explicitly with a space, which is what will be picked up by anything syndicating