That’s right: 20 billion.
That’s the number of spam messages caught by Akismet – the service implemented by WordPress, among other software, to combat junk.
According to the Akismet blog:
That’s an average of around 10 million per day over the 5 years since Akismet first launched. Currently we deal with 30 million spam comments on a typical day, or about 350 per second.
Considering how Akismet is free for WordPress this is one great service. Our Akismet stats show that 6,767 spams were caught, 3,971 legitimate comments were left, and an overall accuracy rate of 98.938%