thanks, this is pretty interesting. the correlation does follow nicely at the beginning but totally collapses after the big bubble burst. now the trick is to guess whether increased activity means drop or rise. it would be cool if an analysis of posts was done looking for positive/negative word indicators and see how that correlates with the price.
I'm pretty sure that the chart does not show a decrease in correlation. This chart is yet another example of why all bitcoin price charts need to be log-scaled. When people look at linear-scaled charts they draw incorrect conclusions.