@liamzebedee With !StatusNet software the hashtags are prominently displayed, searchable, can be subcribed to, can be applied to users, and can be used to send messages to lists of users. Seems pretty thorough content discovery to me. http://sn.jonkman.ca/tags Your project sounds like a good one, and I encourage you to continue. Join one of the open StatusNet or GNUsocial servers so you can do some more research on what's already been implemented http://www.skilledtests.com/wiki/List_of_Independent_Statusnet_Instances