As I have mentioned in another thread, my oldest son was recruited 100% through Rob's FlatgroundApp Twitter account. His videos included velo, in-game video, Rapsoso data. He received, just from Twitter, 7 D1 offers (only 1 of the schools actually saw him pitch in person), received calls from over 14 D1 schools, and received 15 D2/NAIA offers.
In his case, he was grad transferring and was going through a major transformation as a pitcher. He changed his mechanics on his own and added almost 20 pounds. He showed his transformation journey via twitter.