We'll always be best friends (A My Little Pony fanfic)

One day, Twilight Sparkle's friends started seeing each other less often, and everyone constantly broke out into fights. Everypony thought that the group of friends would be better off without them. But, one day, something mysterious happened. As the ponies all look at this, they have to work together as friends to reveal evidence, secrets and more! What is this mystery thing, you ask? Somepony has possibly been ponynapped...