A good leader keeps tabs on the competition, which was likely the goal of Facebook Co-Founder and Chief Executive Officer Mark Zuckerberg when he established a profile on surging social network Pinterest. 
 
 To date, there has not been much activity on Zuckerberg’s Pinterest profile: three pins, one like, 1,176 followers, and he is following 125 Pinterest users. 
 
 The move by Zuckerberg is not much of a surprise, as he also has accounts on Twitter and Google Plus, with similar levels of inactivity. 
 
 Zuckerberg has only Tweeted 19 times, and his tweet January 18 — which linked to a Facebook post where he outlined his opposition to the Stop Online Piracy Act and the Protect Intellectual Property Act — was his first since March 13, 2009. 
 
 His Google Plus page is even more fallow, with no public posts. 
 
 Readers: Do you follow Zuckerberg on Twitter or Google Plus, and will you do so on Pinterest? ||||| Facebook's co-founder and CEO has joined the hottest new social network on the block, Pinterest. 
 
 Mark Zuckerberg's profile, located at www.pinterest.com/zuck, isn't very lively. He is following more than 100 other users, but has posted very little content himself. The Pinterest profile is linked to his Facebook profile. 
 
 While it's too early to say Pinterest poses a threat to Facebook in any way, the simple content sharing site can easily be called the hottest startup of 2012. The site reached 10 million unique visitors extremely fast; it has more than 2 million members (connected through Facebook), and it's already used by more than 100 brands. 
 
 At the very least, Zuckerberg must be curious to see what this little site has been doing to become so successful. Facebook has never been too shy of adopting successful concepts seen on other services; for example, its Subscribe button, launched in September 2011, is an obvious nod to Twitter's Follow.
– The new social networking darling Pinterest has been getting all kinds of attention of late, and now comes a sure sign of validation: Mark Zuckerberg has signed up with a profile of his own, reports All Facebook. It notes that Zuckerberg also has accounts on Twitter and Google Plus, but he's relatively inactive on those. If his Pinterest activity starts humming, it may be a good sign for the site. "The simple content sharing site can easily be called the hottest startup of 2012," adds Stan Schroeder at Mashable.