Facebook is spreading its wings to the broader Web with new tools that will allow users to see personalized versions of websites they visit elsewhere.

The move could change the way people experience the online world, though it could come with deeper privacy implications. By accessing Facebook’s tools, websites will be able to customize the experience based on the list of friends, favorite bands and other things users have shared on their Facebook profiles.

Computers in companies, hospitals and schools around the world got stuck repeatedly rebooting themselves Wednesday after an antivirus program identified a normal Windows file as a virus.

McAfee Inc. confirmed that a software update it posted at 9 a.m. Eastern time caused its antivirus program for corporate customers to misidentify a harmless file. It has posted a replacement update for download.

McAfee could not say how many computers were affected, but judging by online postings, the number was at least in the thousands and possibly in the hundreds of thousands.

Two researchers say they have found a way to exploit weaknesses in the mobile telecom system to legally spy on people by figuring out the private cell phone number of anyone they want, tracking their whereabouts, and listening to their voice mail.