it looks like ReCaptcha is can already decode by spammers.
i suggest that XF will support additional captcha system like
Solve Media, its way better than recaptcha as it shows clear letters
but moving and also some human questions .
lately russian spammers are spamming xenforo based forums.
solve media is a great alternative for recaptch and will help lessen the spam..
plus owners can have revenue from it... http://www.solvemedia.com/publishers/
please make an addon for this as alternative to crackable recaptcha
surely addon developers can make one plugin for xf...
how i wish i can do it myself...
the beauty of solvemedia is
-you as the forum owner will have revenue share if legitimate user solves their media question
-if human spammer can solve the media, then its ok at least you get money out of solving the media for you
then delete his account once spotted.
SolveMedia contacted me and asked if I'd like to switch to their service. The plugin is complete (less some small tweaks) and they'll be sending it over to me tomorrow. I assume we'll see it on their site soon. I'll keep you in the loop.