Your Blog Service Have Two Classes of Commenters?

Have you noticed the shift occurring when you leave a comment on some blogs?  First it was that one had to identify as a blogger from that service or "other." 

Then some services began to require two sets of gibberish letters for the comment to be posted.  Sometimes it was not clear whether it ever happened.

Now a new wrinkle.  At Blogger, for example, if the commenter is "other," then his/her name appears in black.  Took me a few times to figure out that only those in blue linked back to the commenter's blog.

Seems as if there is an effort to exercise a kind of control of the ether.   One day I may  only be talking to others with Type Pad.  No fun there.