Levels of spam have fallen by almost 50% since August 2010, suggest figures.Figures compiled by security firm Symantec show that the amount of junk e-mail messages flowing around the net has dropped 47% in three months.Kaspersky Labs noted a similar fall from July to September, when spam levels fell to 81.1% of all e-mailsThe decline was put down to the arrests of those behind spam-sending botnets, and intelligence work that saw other spamming systems shut down.
http://www.bbc.co.uk/news/technology-11757347