The group buying startup ChompOn has calculated the value of a Facebook posting in driving social shopping — at $14, it’s nearly three times what a Tweet is worth. And likes are worth $8.

ChompOn qualifies that its figures underestimate the values and have relevancy only for the company’s next sale of a group buying opportunity — the startup’s deals let clients completely brand the offerings as their own, in contrast to the co-branding strategy of Groupon and others in the space., and features deals on social media.