The latest technique that the spammers are using is to send a compliment with a link to a web site embedded in it, like this one:
"Always so interesting to visit your site. What a great info, thank you for sharing. this will help me so much in my learning.
Of course "security equipment" is a hyperlink to the site the spammer is trying to advertise.
You have my word that if you comment on a post, even if it's extremely negative, I'll approve it for publication as long as it's not spam. My intent is not to filter out any potential negativity -I learn from all of your comments. I just don't like having to go through all the comments to delete the spam.