I feel that Telegram has replaced Whatsapp in Singapore. And Telegram is very popular with the younger generation. Here are some Telegram channels I feel might be useful for people who are on a constant lookout for deals!
https://t.me/sgcabcodes - Grab/Gojek/Ryde promo codes
https://t.me/sgstudentpromos - Affordable student deals
https://t.me/sgfooddeals - Latest food promotions
https://t.me/sgweekend - Weekend hangout spots
https://t.me/sgtravelpromos - Airline tickets & accommodation deals
https://t.me/budgetbabes - Latest fashion & beauty promotions