Since we are talking the Sign of Peace, I won't use the euphemisms that most in the know call the blog Praytell, but this is what Deacon Fritz writes about the Sign of Peace:
It is worth noting that this is a practice that, in its current form of a handshake accompanied by a verbal wishing of peace, is a largely modern invention, an attempt by the modern liturgical movement to recreate something like the early Christian Kiss of Peace. Those who deride modern liturgies as “fabricated” might present the Sign of Peace as Exhibit A, since it is not something that arose from popular practice and has at best an indirect connection to historic practice. But whatever its provenance, the Sign of Peace seems to have become in the popular imagination a distinctively Christian and Catholic ritual, no less than veiled nuns and altar boys ringing bells. It is one of those weird things that Christians do.
Read the rest there: