FORBES - Several years ago, Strava, a data-hungry, fitness-cum-social network app, published a heatmap showing every activity ever logged, over 3 trillion data points. The visualization appeared to give away the location of secret U.S. Army bases and spy outposts in locations like Afghanistan and Syria. The company published a blog post urging users to review their privacy settings and said it would review "features that were originally designed for athlete motivation and inspiration to ensure they cannot be compromised by people with bad intent."