c# create barcode image INSTALLING AND CONFIGURING WORDPRESS in VB.NET

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CHAPTER 14 INSTALLING AND CONFIGURING WORDPRESS
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Figure 14-12. Sample notification e-mail
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Comment spam refers to comments that are made on your blog by comment spammers for the purpose of promoting their commercial sites. They usually have one of two purposes in mind, sometimes both: They want to get links to their sites in as many places as possible in the hope that a lot of people will click the link. They want to gain higher placing in search-engine rankings by being linked to from as many places as possible. The commercial sites the spammers link to are usually online casinos, drug-selling sites, or porn sites. Quite often, the comments link to sites that don t appear to be commercial sites, but rather seem to be offering useful information about their subject. Don t be fooled. The idea is that you and search engines won t penalize these sites because they appear to be innocent. Often, the comments with links to these sites seem innocuous, something like, This is my first visit to your site. I thought it was great. The spammers hope that the links to these sites will remain in place and gain various advantages, particularly with search engines. At some point in the future, they will switch on the commercial pages, either as links within the text to the commercial sites or by replacing the page with a commercial one. WordPress includes several measures to combat and thwart the spammers. These are available through the comment settings on the Discussion Options page (see Figure 14-11).
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CHAPTER 14 INSTALLING AND CONFIGURING WORDPRESS
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Before a Comment Appears
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The first setting in this section, An administrator must approve the comment, means that an administrator must approve every single comment (including TrackBacks and Pingbacks) before it is displayed on your site. To that end, all comments are placed in a moderation queue. This is the most effective anti-comment spam measure. Nothing gets past WordPress, because you must approve each comment before it is posted on your site. As you can imagine, enabling comment approval is the most inconvenient setting for you and your readers. They must wait to see their comments appear, so you lose out on the immediacy of the blog-commenting system. This can have quite an effect on the ability to build and maintain a community based around your blog. You must also process these comments by hand, preferably at regular intervals in order to maintain some kind of immediacy for your community. That can be a lot of work, given that some comment spammers use automated scripts that can submit many hundreds of comments to your blog each day. This setting is really a last resort. The next setting, Comment author must fill out name and e-mail, simply requires that a comment author fill in the name and e-mail settings in order to post a comment. While not too exacting (you don t need to add a real e-mail address), this setting will defeat a couple of the more basic spam scripts. The final setting in this section, Comment author must have a previously approved comment, works in conjunction with its predecessor. If a comment author enters the same name and e-mail address as that of a previously approved comment, then WordPress will allow the comment to appear on the site immediately. Conveniently, WordPress will set a cookie in a visitor s browser that will allow it to prepopulate the username, e-mail, and URL for that visitor.
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The next group of settings are more directly concerned with defeating comment spam. First, you can set a threshold for the number of links a comment can contain before it is considered to be possible spam and placed in the comment moderation queue. A common feature of one type of spam is dozens of links to sites of a dubious nature. This setting (with a default setting of 2) addresses that. The next setting is a space for a list of trigger words. If a comment has any of these words in it (in any part of the comment), WordPress will immediately place the comment in the moderation queue. For convenience, there is a link to a centrally maintained list of common spam words. You can visit that page and copy the list there into your own list.
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