<h3>My take on this.</h3>

<p>Spam is where a post does not bear a close enough relationship to the question posed, just provides links to irrelevant external material - and/or looks like self promotion to an owners website.</p>

<p>It appears at first glance to be on-topic &amp; relevant.</p>

<ul>
<li><a href="http://meta.stackexchange.com/questions/21823/what-constitutes-spam">What Constitutes Spam?</a></li>
</ul>

<p>The link in the answer seems to have some relevance to the question being asked i.e. The link provided is to an article with relevance to the question posed.</p>

<p>Thus to the Self-promotion issue - this should really have a pattern to this.</p>

<p>Having asked other MoDs from other sites (yes we have a room for just MoDs) - I just got blank looks.</p>

<p>I can only surmise the reason for deletion of answers from other sites was that there was indeed a pattern to the person.</p>

<p>On AU there doesnt appear to be a pattern of <em>self-promotion</em> (yet).  </p>

<p>Thus, I dont believe this falls into the spam category.</p>

<p>The standard comment text would apply though:</p>

<blockquote>
  <p>Welcome to Ask Ubuntu! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference.</p>
</blockquote>