Still possible to not validate these or to notice the user. It is like when posting in the forum except that it is MUCH faster for everyone (you never process contributions, do you? )
What difference does it make compared to what people post in the forum?
We can always delete things added and not yet validated. It is like not processing forum contributions then.
And as I said above, it will be easy to block that feature to some users, if they abuse of it. Like if some put all the time too much background cars. Maybe that could even be applied to some admins