Computers analyze patterns, so a sudden spike in links to a single URL that has a relatively flat "graph" is going to raise a flag, but for a URL that routinely gets links in 'bunches' it won't be an issue.
Now THAT I do agree with.
To me unatural links would be 2,000 links all with different anchor text when G can SEE through Analytics that your site has only had 200 visits in it's lifetime.
G is a computer, those 200 Visits "could" equate to 200 sets of eyeballs.
Which makes it suspicious, how can 2,000 websites be linking to a site that has only been seen by 200 people?
Natural progression if there is ANY truth to what I hear kicked around this place, is that G likes natural links. Well, apparently.
Now, a natural link to me would be, someone reads your content, likes it and links to it, 2,000 links can't happen if only 200 people have read it.
That's where the G algo does the math.
It is a math based machine. Nothing more nothing less.
That is what I think, it might sound like complete crap and probably is, but that is the only logical criteria that G could possibly use to determine what exactly is an unnatural link profile, amongst other things, but this is the main Criteria I personally think it uses. And it is only my opinion.
It is only my opinion and if it sounds like a crock of crap...then bite me. I don't care. It's what I think.
Edited by SelfMade, 26 January 2013 - 07:54 PM.