    Sentence 1: How can | know, that: the information  being presented to me’on a device: that | use has  ‘not been altered through remote administration  tools?    Sentence 2: My ex sent me a message saying that |  blocked her on Facebook. How can a person’ know  that they are blocked: on, Facebook. Are there any  apps/tools or is it that she has. been stalking me?    *  *