Statiistics NZ used cellphone data to track people's movements after the February 22 quake.

Twitter crashed for more than three hours yesterday afternoon New Zealand time – the sixth day in a row the wildly popular microblogging service has experienced problems.

When the service finally came back online, Twitter’s support team acknowledged there were multiple errors, including tweets displaying twice, incorrect character counts, and messages missing from people’s timelines.

Twitter said that disappeared messages would be restored. But NBR’s traumatised technology editor reports his Favourites columns are still wiped.