Got a mac? Use the web a lot? Get it checked out, you might have a Trojan:
http://www.theregister.co.uk/2012/04/05/flashback_trojan_botnet/
http://news.drweb.com/show/?i=2341&lng=en&c=14

Check your system and fix it (ultra-geeky command line stuff, not for the timid)
http://www.f-secure.com/v-descs/trojan-downloader_osx_flashback_i.shtml
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