I have google alerts set up to send me alerts for several things in which I have an interest. Not unusual.
Odd thing is that I get "alerts" about pages with search terms that are old. This happens every so often for a rootsweb page that contains old (2002) posts I made about an ancestor. I'm not certain why I'm getting these "old" pages as "new hits" unless something else about the page is updated.
Of course the "hits" I get are always for things I submitted in the first place.