Android: Facebook app alters shared text

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http://stackoverflow.com – I have an app that shares text with Facebook via an ACTION_SEND intent. When trying to share a URL formatted like this: http://first_second.third.com, what shows up in Facebook is: http://second.third.com The URL is provided via intent.putExtra(Intent.EXTRA_TEXT, "http://first_second.third.com"); This works fine for sharing via Twitter, email, and sms. Why is Facebook altering this text? (HowTos)