We really need context! "Get along" could be said to someone to encourage him to leave. [ Get along now; your work here is done.
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AlpheccaStarsI get on (well) with Joe. (Seems British to me.)It is.
AlpheccaStarsI get along with Joe. (Used in American English)This is also used in BrE. I think that "get on with" and "get along with" are pretty much interchangeable in BrE (in the relevant sense).