Well I will leave that up to the people, let them do as they wish. If someone is not against being PMed then that works. If they are, then this thread can easily be used for a means to get the word out as well. I will say this though, if you as the GM are targeting a large group of people (such as D&D free form, which would attract many) I think it would be best just to give a link to your interest ad or game ad that way it saves you effort and time.
I actually was just thinking that another purpose of this would be to have prospective GM's link their Game Planning ads, or official ads in so they can easily get noticed by the audience they mean to target. A Free Form game tends to drop on the list quite rapidly in the Game Advertisement as well as in the Game Planning forums. So using this thread should help relieve the problem.
Also, since most people do not look in the Game Planning forum, this place is perfect to post the link to that thread. Please do not post an interest/game advertisements in here! The moderators will not like that, but links are acceptable. Sorry for the big letters, call it an insurance policy, I do not want this thread getting shut down because someone did that without being warned by me.
Also, would anyone like me to put notes next to their name if they do not want to be PMed or if they do not mind being PMed? That could be useful info.