Spot site dynamics (2) - list action spaces by their dynamics

by number of people registered in them - by number of people registered in the last week
by number of contents edited in them -by number of contents edited in them in the last week
by number of comments edited in them -by number of comments edited in them in the last week
by number of connections edited in them -by number of connexions edited in them in the last week

could be in a page accessed through an information menu item line as for directories