The inherent issue is that linking articles should be a way to direct your readers to new, interesting content. Something I try to do with enough regularity to make my own blog a good source of information (at least in a topical, time-sensitive sense). I definitely try to bring up subjects that I either have an opinion on (regardless of whether that opinion is popular, or if someone else has written something in a similar vein elsewhere) or where I have found something I haven’t seen around.
This is why I have stayed out of the Apple v Samsung bit for the most part. I don’t know enough about the legal system or copyright law to comment with any amount of wisdom. Moreover, I’ve read a lot of great posts about this subject elsewhere.