The second someone favorites your fanfiction, you have a responsibility to finish it. Someone showed faith in your story, show that you are worthy of it.
Not a serious writer, and occasionally I create or forget about loose ends entire. That being said, I never stop trying to improve.
I also write stories at http://forum.spacebattles.com
I've been writing for about 15 years now, and if there's one thing I want, it's to whisk my readers away into another world, where they can lose themselves in the fantasy.
Gonna try this whole writing thing again.