If you google "Mrs. Zuckerberg," you'll get 267,000 results! Not bad, except that they all refer to Priscilla Chan - not Mark's mom, Donna. Priscilla Chan is keeping her name, and a lot of people can't seem to understand that concept.
Americans still appear to be uncomfortable with women keeping their own last names. In the 2000s, only 18 percent of women kept their name after marriage. But the fact that America keeps assuming that she took her husband's name is somewhat distressing: All of these Google hits lead to articles in which Chan is referred to as "Mrs. Zuckerberg," "Mrs. Mark Zuckerberg," and so on.