to some of us, it is no big deal. I once received an email from my Rav asking if I was the one commenting on a local story on the main page. It happened again when another friend (who I had not seen for some time but we exchanged emails every now and then) sent an email asking if I was commenting in YW.
Simple philosphy: speak truthfully, be reasonably intelligent in your argument/statement/comment, try to be coherent in how you phrase it, be open to at least listen to the other side as you might actually learn something and you really do not have to fear if someone else figures out who you are. in otherwords, if I would not get up in front of an audience and make the same comment, I would not say it here.