Well, facebook has been witnessing a lot of changes recently, the latest one being that directly below your profile picture, visitors have the option of calling you and messaging you. They are shown as per your privacy settings. There's another option called text, however it was unclickable for me(on mobile). However facebook has certainly lifted up the ease with which we can contact our beloved ones on Facebook. Directly send a message or call the person with these new functions. Recently Facebook introduced picture sharing as wall posts and before that new security arrangements were added to prevent misuse.