4) 针对"The biggest red flag of contrived links is if they all read the same. The best way to be real is to mix it up a bit. " - I agree, but I dont think google is really going to care until they start seeing a lot, like thousands of links coming into the sight. Until then its just not enough to be considered that it is not just a coincidence.
4，关于title和alt标签
1) A senior Google engineer told me the other day that placing title tags inside the href tag will improve optimization. I am slowly integrating and it is helping a little with terms that were floating on second pages moving them up slightly.
2) The alt tag is useful only with graphics. You cannot use the alt ATTRIBUTE (not tag) inside the href tag.
3) Alt tag is for an image, title tag is for a link... so in some cases there could be both as in: <a href="domain" title="great cheese"><img src="cheese.pic alt="great cheese" title="great cheese"></a>
4) I have noticed that Google does view titles in links and if all the links on your page have the same title text, it will view it as spam. It also does not like special characters in title text. Just my own observations.
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