I was adding a comment to a post on my own blog in reply to a previous commenter and hit the 'submit' button. What I got next was a pleasant surprise:
This is a captcha, a technique that tests whether a human being is on the other end of the connection, so to speak, rather than a (spam) robot. TypePad has been testing this authentication procedure and this is the first time I've seen it in action on my own blog.
Even though there are varying opinions about captcha, I think it's good to have such a system in place that builds on the TypeKey authentication and comment moderation TypePad implemented last July. If such things help block the spammers, then I'm all for it.
Whether captcha is now being rolled out across TypePad blogs or is still in test, I have no idea. I've not yet seen any announcement from Six Apart.