Hey guys, if you're like me and have been getting a lot of spam on your journals, here's how to try and fight the problem:

On your sidebar go to Edit --> Settings --> Settings & Preferences --> Manage Comment Settings -->

and then I have both "Enable commenting from Registered Users" and under Human Test, Show CAPTCHA while commenting to: "Anonymous commenters"

For some reason just the first part wasn't working for some of my journals, but I've been getting a lot less spam by doing both.