Oh’ idk my bff Jill? That commercial was the talk of the month. “Idk” is used on i.m, myspace, sneding e mail, etc. “Idk” is just a shorter, more convient way to say “I don’t know”. “Idk” makes typing faster, while still getting your point across. It is more informal, everyday use of diction; however, “I don’t know” is used in a more formal setting.
