mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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I am here to announce that I have decreased #spam on my web contact form from 1 message every 15 minutes (for months straight) to 0 messages in the last week by adding a "I am a spam bot" radio button.

I am not joking.

No I am not using something like ReCaptcha, I literally just added a radio button to the list.