Well, the Fourth Circuit Court of Appeals reversed that decision and held:
You can read the opinion here.
Fellow employment law blogger, Dan Schwartz, has some insightful commentary here, including:
Of course, the decision leaves a lot of questions unanswered. Will a “like” always be protected? What if you are “liking” a page just to track it? How do you know when a “Like” is really for liking a page?