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TF-IDF is a measure of how uncommon a term is against expectations inferred from a large dataset. In reference to a search engine like Google the large dataset is the Google Index. So if Google finds that a given keyword, let's say "non-alcoholic cocktail", is uncommon even in documents in which it does appear then it might be given a greater weighting in a page in which it appears. The same page which contains our example keyword, "non-alcoholic cocktail', might also contain another keyword, for example "cocktail", as many times as it contains our keyword and even in the same elements, headings and meta description. So you might expect that the 2 keywords would have equal importance in the eye of the search engine but due to TF-IDF this isn't necessarily true - "non-alcoholic cocktail" would be perceived as having higher importance due to its relative (to the greater dataset of the entire index) scarcity.

For broken link opportunities for link building you can't go wrong with: http://moz.com/blog/the-broken-link-building-bible http://moz.com/blog/broken-link-building-bible-new-testament

As Dennis as hinted we went to https, we saw an increase in traffic and ranking when we swap to https.  We also made sure site speed was rapid as well.

I think a good little memory hook here is hard answers make for easy links - or, in more content marketing times - hard answers make for well ranking content. -- What I mean here is that if you look around, find a question that is being asked but there is no good or really, truly authoritative answer then you have a solid starting point. This still requires you to do all the donkey work but that is the name of the game to some extent! Hope that helps! Marcus

Hey All! Whitespark just posted something quite awesome along these lines: http://www.whitespark.ca/top-local-citation-sources-by-country It's a don't-miss list:)

Buzzsumo is another good source of trending information. It's a hubspot product that allows you to search for what's being shared (popular) by domain or key phrase. There are free and paid versions of the tool. The free one is probably good enough for your purposes.

"Keyword phrases are highlighted with bold/italic/sizing/etc as appropriate", if you would do this purely for SEO I would say not to do it because it looks pretty unnatural.

Hi Aiden! Our top level search functions exactly like Google's so if you're familiar with their search operators, you can use them here. We are planning on updating the search function in the near future though so please let us know what you'd like to see in our Feature Request Forum. I'll also pass this along to our Product team on your behalf. Thanks for the feedback and hope you have a great day!