People can use software from other companies to access Twitter. These programs are called "third-party applications". The Twitter company changed the way this works on 31 August 2010. Now applications must use OAuth to connect to Twitter. This method means that users do not have to give their passwords to the third-party applications. Changing the login system to OAuth did cause some problems. Using OAuth had been optional and programs used to be able to ask for usernames and passwords. However, now third-party applications that try to use a username and password do not work at all. The Twitter company said that using OAuth will give users "increased security and a better experience."