I mean a login user in twitter with single access token. According to: https://dev.twitter.com/oauth/overview/single-user
This is ideal for applications with single-user use cases. You shouldn’t ever share the combination of your OAuth consumer key, secret, access token, and access token secret.
By using a single access token, you don’t need to implement the entire OAuth token acquisition dance. Instead, you can pick up from the point where you are working with an access token to make signed requests for Twitter resources.