HUFFINGTON POST - Dec 20 - Facebook has announced an "experiment" that lets strangers pay to have their correspondence delivered directly to your messages inbox. If ever there was a sign that Facebook has completed its transition from social network to commercial network, this is it. Facebook is trying to turn a profit in a way that subverts the original purpose of the site. Paying for special delivery doesn't encourage socializing. It penalizes it. Special treatment for a message will cost $1 per note, though Facebook is testing other prices as well. At present, users can receive a maximum of one paid message in their inbox per week. The fee also potentially stands to bias us against correspondence that ends up in the spam folder.