Oh please, anyone can post anything online. I'm a little more relieved this is something the media reported to the judge after seeing it on Facebook.
I agree, and think that is why the SBI is involved. They can track the facebook user, and see if he or she is truly a friend of a juror, and investigate if that friend did have texts or phone calls. All of that should be pretty simple to solve. If it does turn out to be true, I don't know what the remedy would be, other than a mistrial, and that seems so harsh for this. But, then, if they were communicating during deliberations, how can you be sure they didn't do other outside research? Or broke other rules?
I did see a post on the golo comments talking about the vote being 9-3 at some point, but I just assumed people were making things up. My guess is a commentator wanted to seem more important than he/she really was.