Spin Points are a variation of Boost Points. They are obtained through jumping off a ramp or incline, and tilting the right control stick (PS3) to the left or right. Doing this usually earns you a 360 Spin and 2,500 Boost Points. 720 and 1080 spins are also possible. Keep in mind that once a player peforms a spin better than a 1080, it just shows the amount of Boost Points the player gets.
The player may still do 1440, 1800, 2160 and higher spins, as long as the player has enough airtime.