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CAPTCHAs are very good at one thing: They prevent postings. Mostly they do it to the automated unwanted ones, but sometimes also to the wanted manual ones. Neither annoying users with three CAPTCHAs per page, nor letting spam annoy them instead is very good. And it's up to you to carefully weight all the options to find that uncanny combination of two evils that yields the least evil result. Ultimately, it's a question of Security vs. Usability: Which pages/scenarios are really worth protecting? Which are just annoying your visitors (and sending them off to some friendlier site instead)?CAPTCHAs are very good at one thing: They prevent postings. Mostly they do it to the automated unwanted ones, but sometimes also to the wanted manual ones. Neither annoying users with three CAPTCHAs per page, nor letting spam annoy them instead is very good. And it's up to you to carefully weight all the options to find that uncanny combination of two evils that yields the least evil result. Ultimately, it's a question of Security vs. Usability: Which pages/scenarios are really worth protecting? Which are just annoying your visitors (and sending them off to some friendlier site instead)?