The Family Activity Feed is tied to your Watch List, Art:
This activity feed shows the recent edits and additions to all of the profiles in your Watchlist.
If you are not on the trusted list for a profile that you edit, you will not see your contribution in the Family Activity Feed. This feed lets you know when other WikiTreers edit profiles on your watchlist.
Your contributions will, of course, be on your Contributions page!
And the Wiki Genealogy Feed is tied to your tags.
You may now consider yourself sufficiently educated for today!!
edit: added sentence in italics