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submitted 2 years ago* (last edited 2 years ago) by IsThisLemmyOpen@lemmy.dbzer0.com to c/asklemmy@lemmy.ml

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[–] Bruce@lemmy.ml 1 points 2 years ago (1 children)

Ask how much is 1 divided by 3; then ask to multiply this result by 6.

If the results looks like 1.99999999998 , it's 99.999999998% a bot.

[–] barks@lemmy.ml 0 points 2 years ago (1 children)

I just tried this with snapchat bot and it relied 2

[–] Bruce@lemmy.ml 1 points 2 years ago

Damn! Now I'm wondering if I married a fellow human or a bot.

[–] troyunrau@lemmy.ca 1 points 2 years ago (8 children)

I'd ask for their cell number and send a verification code. That'll stop 95% of all duplicate accounts. Keep the hash of their phone number in a hash list, rather than the number itself. Don't allow signups from outside whatever region you can SMS for free.

I realize this would mean relying on an external protocol (SMS), but it might just keep the crap out. Would help for ban evasion too, at least within an instance.

[–] flubba86@lemmy.world 1 points 2 years ago

No need to store the phone number hash at all. Discard it after the code is sent. What is the purpose of keeping the phone number hash?

[–] GreatAlbatross@feddit.uk 0 points 2 years ago (1 children)

It would set a higher bar for a bot, but SMS wouldn't stop them.
There are SMS providers that will happily spin you up a number with one API call, then return any messages sent to them. The spam account could have a number, confirm the message, then delete the account faster than a human could solve a captcha.

[–] dogmuffins@lemmy.ml 1 points 2 years ago (1 children)

Is this really true?

Twilio is the biggest sms back end and it's like $10 per number month or something.

[–] GreatAlbatross@feddit.uk 1 points 2 years ago* (last edited 2 years ago)

$1.15/number/month, though that is still some cost.

You're right, the cost would make it a huge filter for spam. But you could conceivably have 1000 accounts on a verified server for just over a grand.

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