Here are my thoughts on the subject:
On Typepad we have the option for "Unauthenticated Commenters" who don't use their social site ID's to sign in, to...
Require readers to enter a randomly generated verification code.... or not.
On reflection, after many years of comfort with the code, Nikita, & I, are willing to check "Or Not" so as to remove this step, from Musngs, and Meowsings, for this reason:
We have the ability to read the comment before we approve it for posting.
The e-mail requirement will still be there, for now, for those not using Social Site ID's, unless we see that removing it doesn't cause the Spambots to flock to us like Cats flock to a stash of Catnip. ;-D
Aside from OpenID, there are 10 Social Site ID's you can use:
With 9 years experience blogging on 4 blogs, I learned years ago, of the scourge that are the spammers, and even as technology improved in the battle, I just felt comfy with the extra steps because it cut down drastically on the number of spam comments I have to deal with on a daily basis.
In our spam Filters, of Trackbacks (TB's) caught by Typepad, on my 2 oldest blogs, and this one, there are thousands of spam that never reached the stage of my needing to see them, going back years, it's just that Typepad has never developed a way to empty the stash:
2 Non-Active Blogs: 56,000 TB's, and 42,800 TB's.
Musings of a Mad Macedonian = 20,391
Luckily Meowsings doesn't get many Spam TB's so it's easy to manage, and rescue good ones.
Recent developements, in the system, allow us to empty, easily, the Comment Spam Filter on this, and his, blog.
As of this morning we both get only a few spam Comments a day, if any, most caught without our knowledge by the system, so we can easily double check to make sure a good comment was not treated as spam.