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.
Kara