My-Technet

regex myspace "[Mm][Yy][Ss][Pp][Aa][Cc][Ee].[Cc][Oo][Mm]"
regex facebook "[Ff][Aa][Cc][Ee][Bb][Oo][Oo][Kk].[Cc][Oo][Mm]"

class-map type regex match-any DomainBlockList
match regex facebook
match regex myspace
class-map type inspect http match-all BlockDomainsClass
match request header host regex class DomainBlockList

policy-map type inspect http Blockwebsites
parameters
  protocol-violation action drop-connection
class BlockDomainsClass
  reset log

policy-map Block_policy
class inspection_default
  inspect http Blockwebsites

service-policy Block_policy interface inside