How it's interpreted it is entirely up to the UI layer. On microblogs, it's surfaced as a retweet-like behaviour, but it's not surfaced at all here, really, except on kbin where it's used to report who has reboosted something.

At its core, it's a republish button, and just as if you were to republish someone else's blog post on your own blog, people can see, if they look closely enough, that you've done it.