Yoshida put his Nintendo ID on Twitter ("ShuYoshida") and has been accepting friend requests and chatting to players about his and their Wii U experience. Don't think Yoshida is just screwing around with the Wii U; perhaps, this is how he and Sony could be sizing up their competition.
But, in what must be the best—if not most humorous—Miiverse trolling so far, Yoshida wrote, "I *heart* PS" in the Nintendo Land Plaza. He added a smiley face and "yosp", which is also his Twitter handle.
This is trolling—it's not mean spirited trolling, and it's actually kinda cute—but trolling is trolling. Maybe Nintendo of America honcho Reggie Fils-Aime should retaliate? You know, go on to the PlayStation Blog, write, "Nintendo4Eva". I would've suggested PlayStation Home, but we know how that turned out.