The National Science Foundation is funding the “Truthy” database, intended to detect “false and misleading ideas,” "political smears," and other "social pollution” in online political activity. Researchers at Indiana University have received $919,917 (so far) for this project. The resulting open-source platform will be made publicly available, including via a web service open to the public for "monitoring trends, bursts, and suspicious memes.”
According to the grant, “This service could mitigate the diffusion of false and misleading ideas, detect hate speech and subversive propaganda, and assist in the preservation of open debate."
So typically American to act like this, sadly. Grow up! Why legal action instead of discussing the problem with the other?
I see it as a bad behavior to copy the other site without a discussion before doing it. However, the best for both sites would be if they shared content and this is something I think both should strive to achieve.
If this would be two-way both sites would benefit as both sites would get more comments and stories. This would also force both sites to keep a nice UI. As soon as one site would get a more annoying UI they would risk having no users.
So my message to both is to discuss and grow up!