Twitter right to think 2-factor authentication a journey, not a destination

Twitter on Tuesday upgraded its first attempt at adding a two-factor authentication option to its service, but the real value is the fact that the social networking site realizes it can't stop there.

Twitter said it will continue to make improvements in securing authentication and filling in gaps; namely, providing better security for accounts shared by two or more users.

Shared accounts are typical for company-branded Twitter accounts. But two-factor authentication that uses a mobile phone as a second factor does not work for multi-user accounts, because the account is tied to a single user's phone. Twitter is also looking at solving other specific use cases.