A picture you upload is stored without what the camera or phone wrote into it — where it was taken, the camera, the time — keeping only which way up it is shown; the picture itself is not changed. A picture on an app’s card loads only for the readers of the message that carries it.
A reaction, mention or reply from somebody you blocked or ignore is left out of Activity and the Inbox. “Is typing” is shown only for somebody who may post where they are typing. A connected organization’s person is told of a message under the name of their own organization.