2007-11-01<\/p>\n
\n Comments are a great way for webmasters to build visitor communities. Unfortunately, as most
\n people already know, comments are also commonly abused by spammers posting overwhelming numbers
\n of links to their own websites. Some use scripts or other software to generate and post gibberish
\n comments. At Google, we’ve been working hard to counter the negative effects of this spam on our
\n search results. Here are some tips for preventing comment spam on your blog or website:\n<\/p>\n
\n Think twice before deciding to enable a guestbook or comments. If this feature is not really
\n necessary or you will not be able to monitor the guestbook and comments regularly, consider
\n disabling it. If you already have a guestbook, check to see if it’s useful to visitors, and if
\n they’ve been visiting it. If not, consider ways to improve the comments\/guestbook feature, or
\n remove it. A lot of spam comments don’t create a good impression. Most blogging software will
\n let you turn comments off for individual posts.\n<\/p>\n
\n Most website development tools, especially blog tools, have functionality that requires users to \n Comment moderation means that no comments will appear on your site until you manually review and \n Together with Yahoo! and MSN, Google introduced the \n By default, many blogging sites (such as Blogger) automatically add this attribute to any posted \n For more information about \n You can use your robots.txt file to block Google’s access to certain pages. This won’t stop This will block Google from indexing the contents of guestbook and any subdirectories.<\/p>\n \n You can also use \n For more information about robots.txt, check out our \n If you have access to the server, you may want to change its configuration to remove HTML tags
\n pass a check to make sure they’re a real live human, not a nasty spamming engine. You’ll have seen
\n these: generally the user is presented with a distorted image or captcha and asked to type the
\n letters or numbers she sees in the image. This is a pretty effective way of preventing comment
\n spam. The process may reduce the number of casual readers who leave comments on your pages, but
\n it will definitely improve the quality of the comments. WordPress has a good introduction to
\n plugins and anti-spam tools<\/a>.\n<\/p>\nTurn on comment moderation<\/h2>\n
\n approve them. This means you’ll spend more time monitoring your comments, but it can really help
\n to improve the user experience for your visitors. It’s particularly worthwhile if you regularly
\n post about controversial subjects, where emotions can become heated. It’s generally available as
\n a setting in your blogging software, under Comments<\/b>.\n<\/p>\nUse
nofollow<\/code> Etiquetas<\/h2>\nnofollow<\/code> attribute a few years
\n ago, and the attribute has been widely accepted. Any link with the nofollow<\/code> attribute
\n will not be used to calculate PageRank. For example, if a spammer includes a link in your comments
\n like this: <a href=\"https:\/\/www.example.com\/\"><\/code>, it will get converted to
\n <a href=\"https:\/\/www.example.com\/\" rel=\"nofollow\"><\/code> and would not be taken into
\n account when calculating PageRank.\n<\/p>\n
\n comments.\n<\/p>\nnofollow<\/code> tags, check out
\n How to Stop Spam Comments<\/a>.\n<\/p>\nBlock comment pages using robots.txt or
meta<\/code> tags<\/h2>\n
\n spammers from leaving comments, but it will mean that links in these comments won’t negatively
\n impact your site. For example, if comments are stored in the subdirectory guestbook<\/b>, you
\n could add the following to your robots.txt:\n<\/p>\nmeta<\/code> tag to block access to a single selected page, for example
\n https:\/\/www.example.com\/article\/comments. Like this:\n<\/p>\n
\n Help Center<\/a>.\n<\/p>\nDisallow hyperlinks in comment<\/h2>\n
\n inside your guestbook. Spammers will still be able to leave comments, but they won’t be able to
\n publish active hyperlinks.\n<\/p>\n