@ashfurrow I said "sure," but thinking about it a bit more, I think it depends on context. If it's your own toot, obviously re-posting is totally up to you. If it's someone else's, maybe ask them if they're OK with you re-posting on Twitter.
I mean, technically, this is a public form (DMs and follower-only messages notwithstanding), but I feel like the culture is such that it would be best to ask permission.