title: Can access token be longer than 255 characters?
body: <p>When allowing login by OAuth (such as OpenID, Facebook, Twitter, etc), we save the access token given by the Oath provider in mysql database for future authentication. In some tutorials, the column for saving access token is <code>varchar(255)</code> and some use <code>text</code>. I wonder if the access token (by common websites such as facebook and twitter) is longer than 255 character needing <code>text</code> column. Should we consider this possibility?</p>