Damar Hamlin Posts First Instagram Since Scary On-Field Collapse

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3:35 PM PT -- Damar Hamlin posted a screengrab of a FaceTime convo he was having with Michael Rubin and Meek Mill.

We're told they were talking about Fanatics -- MR's company -- donating all the money they're making on Hamlin jersey sales to charity.

Damar Hamlin's health has, thankfully, improved dramatically ... so much so, in fact, that the guy is active on social media again ... and his message is one of gratitude and thanks.

The Bills safety -- who's been receiving treatment in a hospital for several days now, following his horrifying on-field collapse -- posted to IG for the first time since the life-threatening incident. He compiled shots of himself, seemingly from the fateful day in question.

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