No captcha?

Hello,
I am learning programming and just discovered this website. But I am curious, how does it protect its users from spammers (people who post illegal or annoying things) without a reCaptcha? I thought clicking this blue box is required to prove that you are not a robot, can you please share any javascript that you use for this purpose?
Thank you and have a nice day,
Brian

>>129
I just don't like you and your need to bump a dead thread nobody else is participating in over and over again, effectively spamming, it has nothing to do with supressing Stallman or whatever political motivations you have been obsessing over for months. At least now the spam is programming related, but it also makes you look a bit insane to keep up with this for months, on top of the year of Stallman posts before this.