I was very recently at a conference where some folks presented their work on using Wikipedia for disease tracking - it's considerably more nuanced than just "better than CDC". Large variation by area, disease, etc.<p>Disease surveillance hasn't been well served in the past decade by breathless attempts to replace existing systems with a "Big Data" solution - syndromic surveillance, then Google Flu Trends, then Twitter, now this.<p>Combinations people! Different data streams tell you different things.