A friend of mine who knows of my history mentioned they just found out one of their FB friends was a jw from hashtag pictures they were posting. Not sure if it was #jw, #jw.org, etc, but those get picked up by all sorts of searches. If the general JW's are doing it, it's a good way to get some real valuable information intercepted by them when they search for the latest FB or twitter postings of the day.