The simplest greetings are the old-fashioned "hello," "hey," or "hi." You can use these in almost any situation!

If you want to be a little less formal and little more friendly, you can go with "hey there," or, even better for over text or instant message, "he...

A chat is generally informal, so saying "hey" or something even friendlier (and slang-ier) like "yo" or "what's up" will do.

The most respectful greetings are formal ones like "hello," or time-related greetings like "good morning" or "good evening." To make it even more r...