How often does one refer to somebody by URL? You may have noticed (I have, anyway) that FB now "helpfully" defaults to an @-mention if you start typing a person

How often does one refer to somebody by URL? You may have noticed (I have, anyway) that FB now "helpfully" defaults to an @-mention if you start typing a person's name, essentially offering it as an auto-complete option. As long as G+ doesn't go down this path, I can live with it, but I don't like that a "mention" automatically implies "full access" to whatever has been said, especially given that the choice of whether or not to share a particular post with that person is presumed to be up to the author of the post, not anyone else who was also included.