You probably already know that whatever you post "for Everyone" can be read by people not registered with Multiply, so when Multiply tells you your post has been viewed by x number of people and shows you their headshots, this doesn't include non-Multiplyers.
But what you may not be aware of is that there may be fellow Multiplyers who are not included in these stats, and this can be relevant even to postings with more limited access, e.g. for Contacts only.
If your friend John, who is registered as your Contact, has set it up so that he gets email alerts for your postings, and then reads your posting on the email without being logged onto Multiply at the time, then this won't register as a viewing of your posting. (If he is logged onto the website when opening the email, then it will register.)
Which is encouraging for those of us who may sometimes feel as though we're speaking into a rather empty, echoey room... though of course just because someone has opened your posting, this doesn't necessarily mean they've actually read it. Big Brother hasn't got that far yet!
Which is why it is so much more encouraging when people leave comments on what they've read. Even if they disagree with you, at least you know they've read it.