What does the "Last Active" time stand for on Facebook Messenger mobile app?

What does Facebook Messenger iphone app "Last Active" online status time refer to on the mobile app? Is the time shown next to a friends name mean the last time they were logged into the Facebook Messenger app or the last time they sent a message usi

"Last Active X time ago" indicates when a person simply opened the fb app or fb messenger app. (Also when they send a msg through the app or ...

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