In general terms spoilers were initally used since the conventional ailerons on high speed a/c caused wing bending and an adverse roll.

Fighters such as the F9F and F11F had only spoilers for roll control. They actually called them flaperons. Those two a/c did not roll about the longitudinal centerline because of the spoilers.
The FJ4 had midspan ailerons but to increase the roll rate a lower altitude and high mach numbers they added some flap mounted spoilers on the FJ4B.

Boeing airliners like the 707,720, and 737 have inboard , outboard, and ground spoilers. The flight spoilers aided roll control at all times. They also could be deployed on both sides simultaneously as speed brakes. All the spoilers are raised upon landing to aid in stopping. The aircraft also have inboard and outboard ailerons. The small inboard ailerons are in use at all times but the outboard ailerons are only used when the trailing edge flaps are extended greater than 15 degrees.