I' m having bit of a problem with parse android library. Auth data of the users is missing in results of query. Therefore ParseTwitterUtils can't tell if the user is linked or not.
In case anyone needs help with this, after reading through old parse community forum i found a similar question https://parse.com/questions/cant-access-authdata-on-the-user-object-cloud-code . The answer given there by Hector(Parser) is : try issuing a fetch() on the user; this should populate the authData field.