I have recently searched for a couple of people on FB, thinking to friend them. I found two. When I went back later, it's like they don't exist! I know that I didn't imagine seeing their page, but last night I went to make a friend request and her page does not come up in my search result. So I asked my husband to log in under his account and search for this person, and her page came right up. Could she have blocked me somehow? Is it possible to block someone you are not friends with or somehow stop them from finding them?