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The list of people you have to or want to say "hello" to on a daily basis. Especially relevant for students in university buildings, or coworkers in a workplace. Some people might decide to put you on their hello lists, even if they aren't on yours! Typically, reciprocity is expected.

Dropping someone from your hello list to just a nod when you pass him or her might be considered a snub by the other person.
by Moggraider February 11, 2009
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