First thing I do after I purchase any smart TV - turn off network access, disable auto-updates (mine is a Sony). So, this way 1) it can collect whatever it wants but it can't phone back home and 2) I don't wake up one day and find myself on a learning curve I didn't sign up for (happened to me once, they completely re-did the UI, for worse!)
I use Apple TV and give it network access instead, this way the TV doesn't have the chance to update. My Apple TV is set to update manually too. Of course, the assumption here is Apple TV doesn't phone home - and I'm no Apple fanboy, but I think this is as close as we get to online streaming with privacy.