There are no spoilers in this post.
I just finished Season 3 of Game of Thrones, and I'd love to discuss it on the net.
Or Episode 3 of Season 2. Only problem is I watched it many months after it was broadcast on HBO, some time in 2012.
This is a solvable problem. At first I thought perhaps Twitter could do it, with some new features. I could say to Twitter -- take me back to April 13, 2012 at 11PM, or moments after the episode I want to talk about aired.
First, people talk about lots more than Game of Thrones on Twitter.
And further, someone else might want to time travel back to that moment to talk about something other than Game of Thrones. And for them, my observations about the episode of GoT would be a huge spoiler.
The time-travel forum would have to be segregated by topic. And there would have to be some way, maybe the way Stack Exchange does it, of voting down or eliminating posts that contain spoilers.