• The classic Od Yishama that’s sung by every wedding was composed by Yankel Talmud for the Chasuna of the Lev Simcha of Ger.
The composer is unknown, definitely not Yankel Talmud.
• Yaakov Shwekey first tried out to be part of Shalsheles, but they felt that he would have more potential on his own. The rest is history.
I find this hard to believe - the Shalsheles guys are Camp Munk friends, not sure how they would've been connected to Shwekey.
• At age 17, Yisroel Lamm got started musically by mistake, while playing with a friend’s trumpet that was floating around his bunkhouse in camp.
Eli Teitelbaum's trumpet IIRC
• MBD Live (1980) had two songs that weren’t on his own albums, Min Hameitzar (later on Yeedle 5) and Y’hi Hachodesh (Dedi – Omnom).
On his Live in Yerushalayim album (1991), there's a song which has never been released officially, not by MBD, nor by any other artist -
Im Hashem• Baruch Levine was the child soloist on Dveykus 1, Journeys 2, and the Abie Rotenberg-produced story tape The Golden Crown.
He was on Dveykus 4 (Hamalach solo), not 1.
ETA: I took a look at that Twitter feed; there's a lot there that's satire. So I'm not sure why I wasted my time debunking some of it