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Social network Multiply is set to launch a browser toolbar for Internet Explorer and Firefox.
MySpace, Facebook and other large networks have toolbars already (Facebook's is official, MySpace's isn't), and Multiply's will do much the same thing:let you know when new content is posted, when you get messages and allow you to post content to the site. Most likely this will solidify the site's existing user base, and won't attract much attention from those not currently on the site.