The tags? Some are tribe tags and others are made up. Tax for instance is just made up. On occassions I tag stuff so I can find it easier later like #lego-sesh or when we went to New Zealand recently #aussies-newzealand it allows me to find the posts anytime by searching the tag. Mostly I make them up but lately have been using the ocd hive tag a lot which you can see as my first tag here.