Yes, you read that right. This is one reason:

And this is another:

This post may be copyright infringement, simply because it embeds those two tweets. Says who? A federal court in New York. This can be as bad as arguing that deep linking is wrong, and should be illegal. Because it is much, MUCH more likely to work as a censorship tool, than to reward and stimulate creativity. To know more, read the reports and comments by the Electronic Frontier Foundation and TechCrunch.