I have my iPhone connected to my work email using Exchange ActiveSync. When I go into "Calendars', I see 3 different Calendars with different colored dots (blue, red, and orange). The red one is my work calendar, but I am not sure where the other 2 came from. I do have Facebook installed...does that add a separate calendar for that app? How do I know which is which, and how do I get rid of one (or the other 2)?