We apologize for the inconvenience. Logins can only be recognized via a cookie that is specific to each individual browser being used, meaning you must always log in. For example, if you are using a browser on your mobile device, that's one cookie. When you use your desktop that's a different cookie.
Also, each one of the apps on your phone (Twitter, Facebook, etc.) has its own browser, which is its own self-contained login environment. Each of these environments have varying levels of ability to retain login information, over which we have no control. This means you may be prompted to log in again after clicking on a Facebook link, even though you might have just logged in after reading us on our app.
We realize this is less than ideal, but currently, there are not any shared cross-browser/cross-device solutions.