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

>>331
Wasn't literally filled with rage, sorry, was just being dramatic about it, I probably was smiling or giggling when I posted it.

I'm doing good! You wanna hear a chorale prelude?