categories for blog and other content

I had installed version 1.9 of ELGG, and once that was set up we had Site_wide categories, this was great as we could define many categories that the users could add their content to.  Then I updated to version 2.3 and I can't find the site-wide categories?  I am new to this Elgg application, I tried to find a plug in and was not successful. 
Did the Elgg developers remove site-wide categories?  Was it renamed to some other plugin that I just haven't found? Or am I simply just missing how to activate this feature?


Best regards, and thanks in advance.