I agree with your answer to the original Q in the presumed context, Beagle, but notice on the Flying Club noticeboard is a bit of a grey area.
One can advertise flight sharing (i.e. flights where somebody comes along and optionally pays his share of the cost, according to the G-reg PPL cost sharing rules) on a website, if it belongs to a reasonably closed group which you have to become a member of. This is done. It isn't necessary for the advert to be pinned to a wall made of a specified material, in a physical flying club.