I run a tech/business blog (thetechee.com) and the amount of spam I get is nauseating. I thought it'll reduce when I switched from Blogger to WordPress, but it

I run a tech/business blog (thetechee.com) and the amount of spam I get is nauseating. I thought it'll reduce when I switched from Blogger to WordPress, but it became much worse. A recent shocker was someone (or a spambot) posting links to supposed child porn on my site. Don't worry, I didn't bother to click it... I haven't yet shut down my comment section, but I set it such that I must approve all new comments. Needless to say, I have a backlog of 600+ comments to approve, and 99% of them are spam so I just don't bother