This train of thought generates from one simple action... A long lost school friend of mine, who recently found me on Facebook, and then immediately asked for my blackberry pin ! I am almost angered ... how dare he? doesn't he know.. blackberry messenger is only for co-workers and close friends and then.. ...it struck me this classification is my head, it may or may not be a norm its written out mentioned anywhere? but by and large everyone get this ... you add every single person you have interacted with as Facebook friend, you share your email with most people you know, phone number with one rung closer group, instant messengers like gtalk, msn, is nearly on the same level as phone and more instant methods such office email and bbm... which connect instantly are an exclusive group.
Is this classification deliberately crafted by the technologist ? Our we are just naturals at creating rules and social etiquettes? In theory, everything can be treated as a all -important medium, depending the number of them you use.... but i guess we just love to create rules....