How about just using a single click recaptcha:

https://www.google.com/recaptcha/intro/index.html

On Wednesday, 16 September 2015 at 06:52:57 UTC, Ola Fosheim Grøstad wrote:
> How about just using a single click recaptcha:
>
> https://www.google.com/recaptcha/intro/index.html

Used that before - still was getting spam.

As Vladimir mentioned - it costs 0.001$ to get Captcha solved :)

On Wednesday, 16 September 2015 at 13:46:07 UTC, nazriel wrote:
> On Wednesday, 16 September 2015 at 06:52:57 UTC, Ola Fosheim Grøstad wrote:
>> How about just using a single click recaptcha:
>>
>> https://www.google.com/recaptcha/intro/index.html
>
> Used that before - still was getting spam.
>
> As Vladimir mentioned - it costs 0.001$ to get Captcha solved :)

Why don't you try to check some stats over post?

I mean: to check some frequencies of common d keywords/combo like "class", "struct", "int", "float", "if(" "while(", "(int ", "(float ", etc that are not common in plain english used by spammers...

On Wednesday, 16 September 2015 at 13:54:36 UTC, Andrea Fontana wrote:
> I mean: to check some frequencies of common d keywords/combo like "class", "struct", "int", "float", "if(" "while(", "(int ", "(float ", etc that are not common in plain english used by spammers...

Solving dcaptcha costs maybe 1$, so it should solve the problem of human spammers (too expensive).

On Wednesday, 16 September 2015 at 16:12:03 UTC, Kagamin wrote:
> On Wednesday, 16 September 2015 at 13:54:36 UTC, Andrea Fontana wrote:
>> I mean: to check some frequencies of common d keywords/combo like "class", "struct", "int", "float", "if(" "while(", "(int ", "(float ", etc that are not common in plain english used by spammers...
>
> Solving dcaptcha costs maybe 1$, so it should solve the problem of human spammers (too expensive).

I dunno, I reckon I could solve them in ~5 seconds each, especially with practice... At $1/solve it'd be one hell of an hourly rate!