When we talk about judging the importance of a blog, there’s usually a clash of semantics. Some people look at the ‘value’ of a blog (how much a blog is worth), others look at how popular / influential the blog is in its niche and overall in the blogosphere (authority).
If you’re looking to place a dollar value on your blog, read this blog valuation article on Performancing. However, for SEO purposes (or if you want to rank blogs in a blog directory, as we’ve done here at EatonWeb) you’d be better off finding the authority of a blog.
There are many different scales that people use to measure a blog’s importance – Traffic, RSS Subscribers, Search Rankings, etc. Unfortunately for a blog directory, we don’t always have access to this hard data and as a result we have to rely on third-party metrics to do the job.
So which 3rd party metrics can we use? PageRank is widely discredited, and Alexa stats are wildly skewed in favor of tech-related sites. It’s not that hard to fake RSS numbers (although you’d have to be particularly desperate to do so), and Technorati, while being again skewed towards the linkerati as opposed to a more representative sample of web users, also has its share of glitches.
The approach many people have used is to combine a host of metrics and use them to arrive at an aggregated score. For example, SEOMoz’s Page Strength tool factors in linkage data from Yahoo Site Explorer with directory listings in Dmoz and mentions in Wikipedia, amongst other things, in order to arrive at a score out of 10 (like PageRank). This is ‘good enough’ but if you want to compare two blogs with similar scores, it’s a poor measure. Using a larger scale (out of 100) allows you to compare site differences better but the question still remains:
Which metrics are the most important?