I'd like to get some other folk's reasoning for being more vocal about their atheism online than in their day to day life. Is the ability to use a pseudonym no one will be able to connect to you as a person make for your ability to speak up? Do you worry about family/friends/coworkers/etc... finding out? Do you see vocalizing your views as therapeutic or as a way to take action to move the world toward secularism when doing so in other ways would get you flak?
I personally try to make my opinion known where I can, but for fear of losing contact with a few friends and most family doing so online is the most readily accessible way to speak to and hear from people both of my own views and theistic ones and have discussions with them without fearing what the repercussions would be in my daily life for doing so. There's also the feeling that if someone I knew found I'd participated in places such as AN it'd likely be people I knew but didn't know were like minded toward religion. It would be cool to find out a friend whom I'd avoided the subject with was actually in agreement with me. Sometimes it feels like there must be more people who question religion, but we don't see each other because there's no way to make it known to other freethinkers without risking the problems that often come with being open with it.