When it comes to the comments section directly on my blog for a given post, I do moderate and have to approve the comments. I do this because of spam. I haven't been spammed lately but it was happening off and on with some annoying level of volume in the past year.
In my recent posts, I have not received any spam. I am hoping that my moderation of the posts has flushed out those who have felt the need to advertise whatever they are selling from skin products to various money scams.
The following guidelines were pulled from the Huffington Post. They lend guidance for posting comments to blogs.