I was setting up a development account today for Facebook, and came across the below code. It looks like Facebook is adopting reCaptcha. I’m glad to see larger sites adopt this – it is a great way to give back to the community and I think will do wonders for the transcription of archive.org documents.
DigitalThom pointed out earlier today that you can’t comment on a mobile phone because of the ReCaptcha on this site. I’ll try to look at that and see if we can get that working so you can comment from your cell from now on.