Hooke's Law

1)Is Hooke's Law applicable for all three states of matter(solids,liquids and gases)? And if hooke's law is applicable for all three states of matter , is there any change among the statements of hooke's law  for solid , liquid and gas? 

2) Upto what exact point is hooke's law applicable? 1)Elastic limit ; 2)Proportional Limit .