Is LinkedIn the Latest Victim of the Social Network Attacks?

Is LinkedIn the latest social network victim to be attacked with a DDoS attack?
LinkedIn was unavailable 5+ hours Saturday, only two days after a rash of social network attacks disrupted services globally. I can’t remember LinkedIn being down for anywhere near 5 hours before. Twitter, Facebook and Google all reported Distributed Denial-of-Service attacks (DDoS) last week. Have the hackers moved on to LinkedIn as their next target? Is this political, the continuation of anti-social media trend started by Twitter and Facebook’s shutdown in China?