I am Portuguese;  from many years I dedicated myself to this area, not only for personal reasons (I was one of the first curious beginners of Excel),but also for professional reasons (because I followed, from the start, the renewal of the technical structure of a Portuguese State Department  in which I still work).

My Excel page: 
http://www.exceler.org

My Excel Facebook page:
https://www.facebook.com/exceler?ref_type=bookmark

My Excel Blog:
http://exceler.blogspot.com