Is Slashdot a blog?
I would call slashdot one of the earliest and most influential blogs, although the fact that they publish reader-submitted stories (not just comments on the stories) does set it apart a bit from most others. Nonetheless, the content is very bloggish. Wikipedia, OTOH, has very unbloggish content, for the most part (excepting the Talk pages and a handful of special pages, but these are none of them the focus of the site).
Perhaps the more interesting question is, is Perlmonks a blog? I mean, yes, the subject matter is technical, but surely there are blogs with highly technical subject matter (e.g., In The Pipeline is clearly a blog, and organic chemistry is every bit as technical as Perl, or at least would appear so to the layman), so I don't think that alone can exclude it.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.