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Don't Send Facebook Messages
There's definitely a hierarchy in email and at the very, very, VERY bottom of that pyramid is the Facebook message. Nobody likes Facebook messages. Nobody likes to read them. Nobody likes to check them. And only monsters send them. Virginia Smith describes the cycle of emotion that happens every time she receives a Facebook message this way, "I feel irritated and then disappointed in myself for feeling irritated at something that is actually reasonable to be irritated with." Exactly. They're the worst.
Do Send a Normal Email
Even though some people (Nick Bilton) get annoyed by these, for the most part, a succinctly worded email is usually welcome. Just don't send too many emails for no good reason. That's why the Google gods invented gChat. And if you're not on Gmail? Well, I don't even really know what to say.