when do you think we should go from? All time is a bit off as there's guys who could be posting things from years and years ago.. I don't mind waiting to post something, I discovered I don't have many videos of real PBs anyway but it seems a shame to miss out in everyone's older PBs. I don't really mind people using stuff from years ago if it means more lifts going on the board.
Also, cucumber, you want to pick a nice neat format for the leaderboards now and stick with it. You can ask people to submit lifts already in the format then boom.
Something like weight: Username (bodyweight) VIDEO LINK
Then you can just C&P it into the OP and it'll save you LOTS of time. And make it a rule people quote you with new thing or you do a sweep then say "updated to post 23" when you do so. Your choice.