Use the arguments MaxHubNum and MaxAuthorityNum to output a maximum of two hub and two authority users.
SELECT * FROM pSALSA(
ON users_vertex AS vertices PARTITION BY username
ON users_edges AS edges PARTITION BY followers
SourceKey ('followers ')
TargetKey ('leaders ')
EdgeWeight ('likes')
MaxHubNum ('2')
MaxAuthorityNum ('2')
TeleportProb ('0.15')
RandomWalkLength ('1000')
) ORDER BY 1, 3 DESC, 5 DESC;