I still write long letters. Only to one person though, mostly. She writes back too, and we are each other's best friend. She introduced me to letter writing 5 years ago.

I've also written really long letters to a writer who has written back. I admire his work a lot. (one letter was 18 pages long, another was 42)

Curiously, I have received long responses from a lot of people, but the chain fizzled out mostly. It's just the two of us who write back and forth. I love writing letters.