I received an email “daily digest of group activity” this morning (for the H+ Writers Network) that told me:
I found that annoying; if there are 0 items for me to look at, in a group, I’d prefer not to receive any notification.
On a related matter: the email contained two hotlinks apparently to “H+ Writers Network”. But the first of these seems to have a malformed URL: clicking on it only takes me to a new copy of my email inbox. (The second one, however, was correct.)