Does a girl touching a guy's back have the same meaning?

I made friends with a bunch of girls this year. I noticed when I am sitting there they come over place their hand on my upper back, say hi etc and leave it there for a bit. Similarly if They are sitting with me and leave they do it again. or if they are far away they smile and or wave to me.
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Thanks for the answers. The girls I have noticed doing it are the socially outoging one but they don't seem this comfterable with other guys. There is one girl I have been meaning to ask out and would feel really bad if I gave these girls the wrong idea.
Does a girl touching a guy's back have the same meaning?
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