msfreed

Thin Content Manager helps you easily identify thin content pages (i.e. posts and pages with minimal textual content) on your site and block them from search engines. The plugin calculates the body word count for each post/page on your site (disregarding words contained within HTML tags and shortcodes) and displays the information on a new ‘Thin Content Manager’ page within the Settings section of your WordPress admin panel. The admin page then provides a simple point-and-click interface to automatically insert robots noindex and nofollow tags – <meta name=”robots” content=”noindex, nofollow”> – into the head section of pages you select. These tags tell Google and other search engine spiders to ignore those pages, which is important for improving your site’s quality score and trust ranking for SEO purposes.
This plugin works with with single site installs only.

Thin Content Manager

See the body word count to identify pages with thin content, then select pages to insert robots noindex,nofollow tags into.

michael_greenberg

PHPEnkoder is a port of the excellent <a href="http://hivelogic.com/enkoder" rel="nofollow ugc">Hivelogic 
Enkoder</a> to PHP and, more specifically, 
to WordPress. It is used to display text in a way that users can see 
and bots can’t.
The encoding system is directly and unabashedly stolen from the 
BSD-licensed source of Hivelogic Enkoder, which works by randomly 
encoding a piece of text and sending to the browser self-evaluating 
Javascript that will generate the original text. This works in two 
ways: first, a bot must first have a fairly complete Javascript 
implementation (in particular, it must have <code>eval</code>); second, the 
decoding process can be made arbitrarily computationally 
intensive. This is similar to the idea of charging computational 
payments to send e-mail, only this is actually implemented.
By default, PHPEnkoder scrambles e-mails in plaintext and in <code>mailto:</code> 
links. It additionally provides a shortcode for manual scrambling, 
used like so: <code>[enkode text="shown to non-JS browsers"]this will be 
scrambled[/enkode]</code>.

PHPEnkoder

Encodes mailto: links and e-mail addresses with JavaScript to stifle webcrawlers.  Automatically turns plaintext e-mails into (enkoded) links.

Thin Content Manager vs PHPEnkoder