‘Big Data, Big Problems: 4 Major Link Indexes Compared’ – MOZ Blog
Russ Jones says, “Given this blog’s readership, chances are good you will spend some time this week looking at backlinks in one of the growing number of link data tools. We know backlinks continue to be one of, if not the most important parts of Google’s ranking algorithm. We tend to take these link data sets at face value, though, in part because they are all we have. But when your rankings are on the line, is there a better way to get at which data set is the best? How should we go about assessing these different link indexes like Moz, Majestic, Ahrefs and SEMrush for quality? Historically, there have been 4 common approaches to this question of index quality…
- Breadth: We might choose to look at the number of linking root domains any given service reports. We know that referring domains correlates strongly with search rankings, so it makes sense to judge a link index by how many unique domains it has discovered and indexed”.
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