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I suppose it's a UI question for your end user. You'll naturally have a permalink for your own post with the "like" on it, but you certainly could have the page auto-redirect to the original. I've been working on a "read" post type that when syndicated to Twitter (for example) has a URL pointing to my site, but when followed redirects from my site back to the original.

I think that the majority I've seen so far just take people to their "like" permalink with the link to the original if the end-user wants to read it.