The Brief: Jwitter means Jewish Twitter.

DEEP DIVE
Jwitter stands for Jewish Twitter. Similar to that of Black Twitter, it is not a separate platform, but a community of Jewish people on Twitter.
*Jwitter collectively turning its head towards this tweet* https://t.co/JnG79SP28r
— Lady Hoofington Has A Vaccine Appointment π β‘οΈ (@PhD_femme) February 12, 2021