Comment Spam Without Links
I noticed this yesterday and today: Comment spam without links, just saying "Hey, your site is great" or something similiar. However, looking in the log files, it is plain clear that this comment was done by a machine.
The idea behind is explained by Aysmptomatic:
There is a toggle in WordPress (this may be a 1.5-only thing - I haven’t checked in 1.2) that sends all comments to moderation unless that user has commented before. There are actually a couple of spam plugins that check this, too, automatically whitelisting anyone who has already left an approved comment. This is a good thing, but you have to be careful not to get duped into approving a spammer’s unobtrusive comment.
If you did approve one of the many comments that sound like, “Just found your site, and it’s exactly what I wanted,” then you’re likely in for a surprise. The spammer script will notice that the old ocmment was posted, and it will post another comment using the same email address that actually contains URLs. Sneaky, eh?
Luckily, Spam Karma catched them all.
But the problem is that how to determine the comment is not a spam. For that you cant suspect evry comments. As the blogger starts the varification code methods so every one are ready to use it.
But no body can sure the which is the junk comments.