And the compliment of that #universallaw: the simpler the text-publishing service, the more interesting uses it’s users will put it to, provided it paves their cow paths (e.g. Twitter with RTs, #hashtags and @-replies).
Give users constraints and simplicity, see what they do, then solidify that functionality — or, from an #indieweb point of view, give yourself constraints, then pave your solitary cowpaths.
.abigailH hashtag discovery usage is low because of Twitters anaemic implementation. See Diaspora for a great, well-used implementation.