They Called Him Mostly Harmless

“A hiker found dead in Florida wilderness is identified by internet sleuths after 2 years. His identity triggers more questions as multiple hikers claim to have met him, but he never revealed his name.”

https://www.imdb.com/title/tt31049718/

I thought it was pretty good. The internet sleuthing to find his identity turned hateful, but that competition eventually is what worked.