Trying to figure out where the neckbeard adjective came from.
No photos on the ad.
Unless it actually started elsewhere, it's an Arfcomphorism.
My take on it is the vaguely Duck-Dynasty-Lite looking retired/unemployed/underemployed men who have nowhere else to be/nothing to do that they can easily line up at Walmart at 7am with McDonald's coffee, and clean out the .22LR that does show up into stock to try and scalp it.
The neck part of the beard, is to the unemployed/retired status that they don't need to shave their neck...