Users can post with other account!

Hi,

I've updated the module from an old version.

In my site, users are able to post content on twitter (they have to select the option on edit/create form). After the update, on the same form, a new select has appeared. In this select there is a list with all the twitter accounts connected on the site, and users can select an account and post on this twitter account.
For example, I'm connected with the account @dromansab, and I able to post on @example twitter account...

It is a brutal security hole.. How can I disable it?

Thanks!