LONDON - The UK's biggest newspaper publisher, Trinity Mirror, is pursuing its online advertising expansion with the acquisition of realtor directory Email4Property for £4.4 million ($8.1m; €6.4m).
   TM, whose 250-strong stable of titles includes redtop tabloids The Mirror and The People, last year bought four classified websites for a total of £92.7m, led by the £50.5m acquisition of the recruitment service Hotgroup.