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ZachThere should probably be a FAQ for Friendica, since this question comes up a lot. In short, there isn't any way to implement this currently on a distributed social network. It's one of the prices you pay for not having everyone's information on one company's computers.
More info here:
https://macgirvin.com/display/mike/186106link
https://github.com/friendica/friendica/wiki/FAQ
And it is possible to implement it on a distributed network, but this presents a few issues.
1.) Posts which have to be copied to all sites on the network that are "listening" to that tag, and
2.) Making spam easy (tag spam is quite a serious issue on identi.ca for instance)
but mostly
3.) It creates a natural bias towards large sites which hold more tagged content - if your network uses tagging instead of other conversation federation mechanisms such as groups/forums.