Even if you use a comment spam blocker like Akismet on your blog, not all spam comments are caught and blocked from appearing on your blog. Spam comments can hurt the user experience on your blog, particularly if they include inappropriate language or links to distasteful Web sites. Use the five types of less-obvious blog comment spam listed below to identify and remove those comments.
Keep in mind, not all spam comments include a spam link. Sometimes, spam bots are simply phishing for blogs that accept and publish their comments. Once those blogs are identified, then the onslaught of spam comments follows!
1. The Gibberish Comment
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Some comments that appear on your blog might look like they're written in another language that uses unrecognizable characters or they might include a bunch of letters in your native language that are meaningless. It's safe to assume these comments are spam. Think of it this way, if your blog is written in English, most people will leave comments in English, so if you're unsure if a gibberish comment is a legitimate comment in a foreign language, err on the side of caution and mark it as spam or delete it.
2. The Link-Filled CommentEven if a comment left on one of your blog posts isn't blatant spam filled with links leading people to sites to purchase Viagra or download pornography, it's a common belief in the blogosphere that comments left on a blog that are loaded with links for the primary purpose of getting people to click on those links (even if those links are 'veiled' with a semi-legitimate comment), are spam. Mark them as spam or delete them.
3. The 'Good Info' CommentComments that include a word or two that provide no value to the conversation and are incredibly vague, are most likely spam. For example, comments that say, "good info," "great blog," and similarly useless information, could very well be spam. You could follow the link provided in the URL field of the spam comment (copy and paste it into a new browser window, don't just click it) to try to determine if the site adds value to your readers or is suspicious. However, most of the time it's safe to simply delete these comments as spam.
4. The .info, .ru, and Similar CommentsThere are many legitimate Web sites with .info and .ru extensions, but over the course of my blogging career, I have seen a lot of comments make it through my blog comment spam blocker from people who include URLs in the comment URL field with .info and .ru extensions. If you come across a suspicious comment with one of these extensions, check out the site and mark it as spam or delete it if it still seems odd.
5. The Overly Complimentary CommentIf you get a brief comment that says something incredibly complimentary but adds little additional value to the conversation on the associated blog post (particularly if the grammar is poor), it's very possible that comment is spam. Follow the link provided and check out the site referred to in the URL section of the blog comment form. This is a common spam technique. Everyone likes to publish compliments on their blogs. Spammers know this and play into a blogger's ego and desire to grow their audiences by including a vague yet highly complimentary comment along with their spam link. Mark these comments as spam or delete them.