Based off the very rough comparison of my SAT score with my GRE score, my IQ rose around 10 points in the interim (a gap of about 10 years), and I did begin reading LW during that period. However, my own impression is that most of the increase (if it even exists) came before I started reading LessWrong, and the increase instead came from economics blogs and literature recommendations which I mainly got from economics blogs. One of those early blogs was OvercomingBias, so I suppose that could be seen as a win for LessWrong. Previously, most of my reading had consisted of either school work or fiction, typically Sci-Fi or Fantasy.