Comments like this one [1] in this thread [2] didn't just appear out of nowhere. There was plenty of wild speculation (the worst of which has since been edited or deleted) in that thread in the hours following the event.

This widely circulated spreadsheet [3] contains a "suspect summary", not a list of "somewhat interesting people".

1: http://www.reddit.com/r/boston/comments/1cf5wp/2013_boston_m...

2: http://www.reddit.com/r/boston/comments/1cf5wp/2013_boston_m...

3: https://docs.google.com/spreadsheet/lv?key=0AgtCl8YvqiBodEl0...