I can assure you that they do - I have been previously employed myself by the insurance industry to watch out for certain "loopholes" and discussions on forums with regards to bypassing vehicle security for a particular marque of car to assist with claims against theft. I have no idea who is monitoring us, but I can promise you that someone will be.

http://www.dailymail.co.uk/news/article-2321458/Biker-caught-doing-122mph-went-internet-forum-ask-advice-avoid-speeding-points.html

Not seen that particular one before -

Recent media reports about everybody getting caught out by stuff posted on facebook also goes to prove that anything written on a public forum can easily come back to bite you on the bum