Re: fyi: WP-reCAPTCHA works fine with BuddyPress
Hi r-a-y — would you be interested in posting your validation function code? (pastebin it perhaps?)
Just want to avoid reinventing the wheel. I also found a plugin in bpdev that appears to be doing this, as well, even down to adapting the existing WPMU recaptcha plugin, but it doesn’t seem to work / was never finished. I haven’t worked out just why yet, however. 
http://bp-dev.org/download/
You active bpdev-core and then bpdev-nospam.
