I was informed that, one gets multiple (70) times reward for performing virtuous deeds on a Friday, is this for any good deed (like Salaat, charity, etc.), or only certain ones, like Dhikr of Durood?

1. We cannot recall any narration that mentions that all deeds are multiplied 70 times on a Friday. If you could provide a reference, we can check further. Please find attached, 'Virtues of Jumu'ah'.
2. The virtues of Ramadhaan will be multiplied by the virtues of Jumu'ah, thus, making it multiplied in virtue. Refer attached, 'Virtues of fasting.'

and Allah Ta'ala Knows Best

for Mufti Ebrahim Desai
FATWA DEPT.