I'm not as much in the know as some on this board, but I've never felt like my follow of Ken Rosenthal was misplaced. From my experience, he tends to have at least a foundation for his smartphone tweeting. What's actually kind of funny is that he doesn't officially attach his name to, for instance, this Miley ******** going on. He simply retweets the guys doing the reporting. In this case, Morosi. It kind of allows him to get in on the breathless click-baiting but also lets him keep professional credibility by not taking actual credit for breaking out-and-out lies if that's what they turn out to be.
MLBTR is okay too, although, they and Rotoworld all tend to end up parroting each other. It's a lot more transparent if you follow all of them how much the information is pretty much up for grabs.