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Personally I prefer "log in" to "sign in" because it makes it stand out more from "sign up", thus hopefully leading to fewer users accidentally selecting one when they wanted the other. And regarding the variations, I've always been under the impression that "log in" is the act of logging in, while "login" is either the situation/event ("a login happened") or an alternative term for username.

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You're right that "log in" is more distinct from "sign up" (and works because "logging up" doesn't make much sense), and I definitely agree with you that 'login' is a noun, if anything!

Both "log in" and "sign in" are anachronisms though - they're justified when you're actually signing-in-and-out of a computer system or building to log your visit, but the metaphor doesn't technically make as much sense when you're talking about authenticating the user on a website.

The evolution of the terms does let you nicely abstract away the actual mechanism of authentication for a user, which I suppose is the point.

> to log your visit

That is what many systems will do when you "log in", so to me that makes the most sense.

Actually, some people like consistency of sign up / sign in / sign out actions.

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