While many Australians raged at the outage from an organisation whose sole purpose was to collect and collate information, others found irony in the supposedly state-of-the-art system driving people nuts.
Alex Ward said the "census is driving me senseless", after trying to log on through three different web browsers, devices and networks.
"The whole situation is chaos. I would just like to get home from work on census day and do my census without issues," he said.
"Sure it's a one-off event that only happens every 4 years or however long of a time interval it may be, and they can't expect to have servers perfectly tuned, but come on."
Others took to Twitter to poke fun at everyone from Malcolm Turnbull to the ABS. Here are the best reactions.
