I remembered a few days ago, I started to share my blog posts in a discovery engine called StumbleUpon (a discovery engine that recommend web content to its users basing on their indicated interests), upon further checking, it is confirmed that the source of the surge is mainly from StumbleUpon. In short, selected posts of mine went "viral" momentarily within the site and hence more users are seeing my posts.
Following are two posts that went "crazy" with 4-digits pageviews each :
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