It may be because my lense is distance-oriented, but it feels like distance runners (and former distance runners) are the largest group of Track & Field fans. It also seems like most of the Track fan websites I know about (e.g. Flotrack, Letsrun, Runnerspace, etc.) have disproportionate coverage of distance running compared to other events. Is it just because I'm not as aware of spring/hurdling/throwing/jumping sites?