How to turn off facebook synchronisation

Ok first of all yes it is possible, but it does take a fair bit of practice to perfect it.

The best way to injure someone is while you are running alongside your opponent, let them move ahead of you just a little bit and then try a slide tackle. If you time this correctly it should work

You can usually see a small bit of each left/right path as you approach a T-junction unless something like a large tree trunk is blocking your vision.

Generally I use this information to avoid gaps in the running track because I find swiping to turn and then immediately swiping to jump especially difficult during the faster parts of the game. However, if you've got faster fingers than I you may benefit from knowing the exact location of that first jump after a turn.

There's nothing special about which direction you turn, and you can make 3 turns in the same direction and not see a repeated section (however that works physically... I'm not sure). There is no benefit from always turning in one direction, you should just use the visuals you see approaching a junction to make the best decision.