To list services use the follwoing command.
adb shell dumpsys activity services
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specifying the action and data uri
adb shell am start -a "android.intent.action.VIEW" -d "http://developer.android.com"
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specifying the action, mime type and an extra string
adb shell am start -a "android.intent.action.SEND" --es "android.intent.extra.TEXT" "Hello World" -t "text/plain"