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Captcha yes, captcha is not it?

Captcha, that is the word verification that sometimes it is requested on a website to post a comment or validate a registration.
The idea itself is clever and useful: to prevent automated programs from acting on our behalf, then signing up on sites that do not interest us or blocking the sites of unwanted comments.
Even blogs hosted on Blogger, like mine, have the option captcha: You can activate it and then want to force anyone to comment on a post to add the magic word.
As in all things, there are pros and cons. The use of captcha, valuable in my opinion if you are recording to a particular web service, but in the long run is detrimental to the life of a blog.
The blog lives on not only posts written by the author, but especially the comments from other bloggers and visitors. A blog without comments is like a discussion forum with no answers at which point you might as well make some of the traditional static web page. I go to administer and some forums : I tried to think how it would be heavy usage with the introduction of the captcha. A real madness! Captain sometimes heated discussions and very active, quick as a voice conversation: die at birth if any response should occur in good faith with a captcha!
The same goes for what I think a blog. At the captcha
was also active on my blog, but long ago I also received an unwanted comment, real spam, and shortly after I read an article Robydick , reported on the blog Lara . I immediately agree on a blog that the word verification is more damage than a gain!
So how to avoid the invasion of spam?
Robydick to disable the anonymous comments: good advice! In fact on my blog "Chridhe Gàidhlig - Gaelic Heart" time ago I had happened to a real invasion of hundreds of anonymous spam comments, and I proceeded to immediately turn off the ability to registered users to leave comments.
this solution can also be a disadvantage, because they force their visitarori to activate multiple accounts in order to interact with different sites. Luck is that Blogger lets you choose between several popular and widely used account.
I hope that my decision to eliminate the captcha levying the approval of those who follow me. Personally, after weighing the pros and cons, you are encouraged to every blogger. Thanks Robydick and Lara!