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A number of popular apps such as Spotify SPOT, -0.06% and Tinder experienced outages on Friday because of what Facebook Inc. FB, -1.08% said was a bug in its software for iPhone users.
The issue relates to Facebook’s software development kit, or SDK, which many developers embed into their apps to allow people to use certain services connected to Facebook. Some apps, such as Spotify, allow users to log into their services using Facebook accounts.
