Yea, I'd agree with Tobi, these are all used the same usually. However, they all have unique interpretations as well: "See you around." "I'll be seeing you, then." This means that you will see the person more than once, or regularly, in the near future. So, if you use it when you *won't* see the person regularly and soon, it can be funny/sarcastic/ironic. "See you later." "See you in a while." This means that you will see them once or more in the near future. Likewise, if used in another situation, it is taken as irony, and not wrong or offensive. (This is used in movies/cartoons sometimes when someone is about to kill someone else, as sarcasm) "See you next time." "Until next time." This means you will see someone again, sometime in the future, but not necessarily soon (depends on the context). This sounds a little more formal, only use it with friends as a joke or if it will be a long time before you see them again. "Farewell" "So long" "Bon Voyage" These are all expressions for a humorous or slightly exaggerated goodbye. They can be used formally. "Adios" "Sayonara" "Ciao" These are all borrowed goodbyes from other languages, they can be used between friends (at least in American English) for a bit of ~flare~ :) "See you" "Goodbye" For any situation!

Erm, "see you around" implies you'll be in the same area as the person you are parting with. Just like "see you soon" means you may run into each other in the near future. A simple "see you" gives no indication when or where you will see each other again. It is almost like saying goodbye, except that "see you" guarantees meeting again and "goodbye" does not. Even so, most native speakers use these phrases as if they mean the same thing. Hope I helped without overcomplicating it.

see you = see you around = see you later = I'll be seeing you They are all informal greetings that you use when you are leaving somebody. = goodbye (formal)

There are subtle differences between all the expressions, but all of them are acceptable. Just pick which one or two you prefer. For example, I prefer "see you soon" instead of "see you later" because I like to make it clear that I'm interested in meeting again (whereas 'later' is indefinite, and can also mean 'never'!)