"All good things must come to an end. The time to make my exit has arrived," he said.
Any party requires a strong mandate to rule as the government, he said.
He survived the attack as the cobra's bite was not venomous.
Such actions are not suitable for governing Singapore, he said.
They'll work "doubly, triply, hard" to secure a strong mandate, he said.
Twitter had over 7,500 full-time employees as of last year.
Earlier, a bomb threat had been made at the venue as well.
Some items are going for as low as S$0.99.
The 34-year-old is survived by his 1-year-old son Prince.
A labour of love turned commercial success.