Honestly, I think this is just the nature of the social beast that we are working with. Whether things get "picked up" or not are often based on a lot of arbitrary, impossible-to-track variables such as "how many people interested in WalmartLabs happened to be looking at /newest within 20 minutes of your post". While there are definitely instances of causality that can even be extrapolated into trends, luck is always a key factor in these services