Deleting messages off of your stream.
Someone posted something rude on my stream and I would like to delete it. I don't know this person and I don't want this message on my stream.
If you find the comment, at the bottom of the bubble there is a like or delete button. If you click delete the whole bubble will disappear.
Go to their profile and click on the gear symbol in the corner to block them. Does that remove the messages?
I do not believe that removes messages posted on activity, only on the actual stream.