In August of 2013, we reported on this new feature and analyzed several dozen keywords and which domains were lucky enough to be featured as an in-depth article.
Out of the 30 queries that we initially tested, there was approximately a 60% change in the results displayed. In short: the in-depth algorithm can fluctuate just as frequently as the normal algorithm.
For instance, the query “Obama” originally displayed results for:
But now displays results for:
On average each SERP had at least 1 result fluctuate, some had 2 and a few had 3.
In addition, we are seeing more and more in-depth article results for brand name queries, whereas initially we were primarily seeing results for generic queries (with a few exceptions).
This is good news for search marketers. If an article gets enough authority, it may be given a slot in the in-depth article results in the next update.
I’m definitely going to continue to monitor the SERPs for any signs of change in the in-depth article arena.
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Part 1 - An SEO's Guide to Tumblr
Part 3 - The value of Tumblr links revisited