Correct, coccinelle, but we only shake hands on first introduction , and that not on every occasion; we reserve it for the slightly more formal ones, as at dinner parties when we meet strangers. People meeting strangers casually in a group with friends would not shake hands. On business meetings; with the bank manager or lawyer, say; we shake hands. This is all in marked contrast to French practice, where even young people meeting up will shake hands and every time I drop by at my French estate agent, who I have known for thirty years, I shake hands with him and any staff present.