I worked at an SEO firm that had a range of client sites, including two of the three companies with the largest search engines. As with every update a large amount of speculation, with little data analysis, would pop up.
Content, Improper site setup, canonical tags, robot.txt changes, there are a significant number of issues that can impact rankings.
Unfortunately, instead of checking these owners of the site would always speculate that the impact was due to some new factor that certain SEO firms would perpetuate for marketing purposes.
If your to learn anything from these types of articles, its know your audience and create content for them.
Content, Improper site setup, canonical tags, robot.txt changes, there are a significant number of issues that can impact rankings.
Unfortunately, instead of checking these owners of the site would always speculate that the impact was due to some new factor that certain SEO firms would perpetuate for marketing purposes.
If your to learn anything from these types of articles, its know your audience and create content for them.