If you seek the social activity that best fits the power of social media, look to the past so you may see the future: Look to the timeless practice of bartering, or the rise of the “Sharing Economy,” in which technology allows people the world over to exchange goods and services without using money; look at the opportunity the Web offers to make this exercise an international enterprise, strengthened by the urgency of social media and popularized with the publication of every post and tweet concerning this spontaneous phenomenon; look to a revival of classic values – look to the everlasting virtues of trading with trust – that can be as intimate as they are immediate.