I read in the Quran in Surat al Zilzaal that we will on the day of judgment be split into groups and see all of our deeds, good and bad. Do we know if it will just be us seeing our own deeds or will our deeds be broadcast on that day to all of mankind?

One of the punishments for the evildoers is that their evil deeds will be exposed before others on the Day of Judgment. However, if someone repented for his sins and died with faith, Allah will protect him and not expose him on the Day of Judgment.