I would recommend that you use some basic filtering if you are planning on opening your wall to others, especially if it is for a business. You'd have more control over what was posted that way... and not end up with a bunch of things that you do not want on there. Try not to make the parameters to tight, otherwise people will become frustrated at not being able to post, but make sure they're narrow enough to not allow undesirable advertisement up there. It's fairly simple to do, just go to the security icon (padlock) on your page. Good luck!