Everything is writing: emails are writing, blogs are writing, shopping lists are writing, songs and stories I make up for my daughter are writing, playlists are writing, the smiley face you add to a thank you note is writing, music/cooking/coding/math/architecture/fashion/etc. is writing. Yes. Even etc.
But people want the hits. For me, writing is authoring (and, hence, the shopping list writer is as much an author as the novelist). But I may be in the minority.
Click the embedded links above to hear more about those.