you're probably writing about chips, which means the 'rest' of the world is probably not interested in what you have to say. For example, I don't frequent vegan webboards/rings since i am not a vegan and the topic doesn't interest me.

If you are writing about chips or are interested in them, wouldn't you want all those interested in chips to hear what you have to say?

If you think your identity is going to be stolen or compromised. It was done long before you logged in here or typed a message.