Was the John-Titor story just another yarn using the theme of time-travel?
"Would you believe it? Fifteen years ago, on March 24, 2001, the individual posting as John Titor left his final message on the Post2Post Art Bell forum, leaving behind a timeless mystery, and one of my favourite urban legends of the information age."
http://www.strangerdimensions.com/2016/03/23/john-titor-final-post
The JT TT story still remains as an interesting one to explore & compare with others.
http://desertshapes.blogspot.ca/2016/03/the-john-titor-enigma-and-time-travel.html
There could be various types of beings that have achieved technological time travel. Sometimes they might seem to be human but upon closer inspection, they are some other type of humanoid.
http://www.strangerdimensions.com/2015/08/07/are-black-eyed-children-time-travelers
They could also be from another inter-dimensional plane of existence & can only temporally seem human.
Of course, there is quite a plethora of books, movies and TV series that provide interesting depictions of traveling through time.
Quantum+Leap:
https://en.wikipedia.org/wiki/Quantum_Leap#Premise ,
https://www.youtube.com/watch?v=DjK9GJMBpt0
Random temporary walk-in time travel but with some interactive assistance.
http://quantumleap.wikia.com/wiki/Quantum_Leap-
https://weminoredinfilm.com/2013/08/16/5-sad-truths-you-realize-when-re-watching-quantum-leap
http://memory-alpha.wikia.com/wiki/Star_Trek:_Enterprise ,
http://www.imdb.com/title/tt0572192/?ref_=ttmd_ph_tt2 ,
http://memory-alpha.wikia.com/wiki/Temporal_Cold_War
https://en.wikipedia.org/wiki/The_Time_Traveler's_Wife#Plot_summary
A person that has a natural, yet uncontrollable ability to travel through time.
https://en.wikipedia.org/wiki/The_Time_Traveler's_Wife_(film)#Plot
https://en.wikipedia.org/wiki/Edge_of_Tomorrow#Plot ,
http://www.edgeoftomorrowmovie.com ,
http://www.rottentomatoes.com/m/live_die_repeat_edge_of_tomorrow
