To study Friendship.
Twilight infers a time of day when it is safe for vampires to come out and not sparkle. (:
Twilight Sparkle's middle name is actually "Twilight". Her full name is Twilight Sparkle.
Most likely, she will.
There is a good chance of it. There is going to be a third movie, and the scene with the other Twilight appears to have been a sequel hook.
Lilac.
Twilight Sparkle
Twilight Sparkle
Yes, Twilight Sparkle will live in the Castle of the Royal pony sisters when it is repaired.
Spike
Shining Armor is her older brother.
The sun makes their skin sparkle.