You’ll notice that I have popped a captcha on the bottom of the comment form on every post. This is because I get around 1000 spam comments per day (!) and I hope that by putting a simple question, none of these bots will be able to post spam comments and block up the server!
The questions had to be something mathematical (there was no option for a picture-based one) but they are basic addition and should be very easy for everyone to work out. I’d welcome any feedback about how they’re working for you!