So for instance this post should be tagged #sports and #soccer, but then might have a community tag of #worldcup or #fifaworld cup or whatever? Moreover, is there a FAQ available yet? Thanks! Edit: Imagine that, hubski.com/faq...didn't even think to try...
Also, take a look at the bottom bar on your page. Lot's of interesting info there FAQ/ABOUT and a Tutorial. Also, TMI is pretty cool. Good luck! Let me know how else I can help. -seriously.
I tagged it sports purely to increase the number of people who saw it. If you check the tags page up top you can see how many people follow the most popular tags and so on. Each post gets two tags of your choosing and then a third community tag can be added by whoever feels like it. You can tag anything whatever you want, it's the choice between specificity and reaching a wide audience that makes it interesting!