I wish more people would realized how cheap and easy it is for spammers to break captchas and how extremely hostile captchas are towards people with disabilites. Deaf-blind people aren't helped by the sound alternative, the few times that's even an alternative. The only protection captchas give is one of inconveniance for spammers, it's not a working obstacle and the whole idea is flawed.
Spammers can be fought by traffic analysis, communication caps and community based moderation. Even if you are absolutely insisting on captchas please don't do it as a first line of defense, use them on spikes like how youtube handles mass comment voting.
Spammers can be fought by traffic analysis, communication caps and community based moderation. Even if you are absolutely insisting on captchas please don't do it as a first line of defense, use them on spikes like how youtube handles mass comment voting.