Mashable - Web discovery tool StumbleUpon launched a revamped iPad app on Tuesday features the service's first "social bar."The new bar creates a section on each "Stumbled" page that highlights a user who also liked the page. If someone who you follow on StumbleUpon liked the page, his or her avatar might show up there. If not, now might be the point when StumbleUpon introduces you to someone new who you'd like to follow. You can click through to his or her StumbleUpon profile to see whether this is the case.
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