Nintendo's Miiverse seems pretty progressive, by Nintendo standards. You'll be able to see other friends' statuses, leave messages or tips, and take screenshots. But if you were expecting unfettered access to leave any message you want, no such luck. This is Nintendo we're talking about.
The last thing the company wants is a special episode of Dateline devoted to this new predator's tool, so it will be checking the messages to protect children. The company is hiring special "human resources" employees to moderate messages before they go up. This will delay the messages, and Nintendo is hoping to keep that delay to around a half-hour.
"The attraction of a social network is the immediacy of the feedback," president Satoru Iwata told the LA Times. "But personally, I think 30 minutes should be acceptable."
The Miiverse will also use automated content filtering for dirty words, and a user-end system that lets you flag inappropriate content. Between the first two methods, though, it seems unlikely you'll ever really need to flag a message. Nintendo is intent on keeping Miiverse squeaky clean.