Perhaps our experience can help. We were presented with our postings on this forum and printouts of our facebook pages despite the fact that our privacy settings were high and I always posted personal experiences in the members only section of the forum. We had no JW friends on facebook and had successfully faded for a year. Just because you use a pen name does not mean that you cannot be traced from the information you share.
For us it was not the end of the world we were ready to start afresh and it was not the trauma it could have been.
Anyone who has signed up to the forum can read members only stuff whether they post themselves or not. Anyone can send you a pm claiming to have had a similar experience and gain information you would not share generally. Friends of friends can see facebook posts you have comented on.
Feel free to express views but be careful what information you share with people you do not know unless you are ready to leave.