sdk/src/com/socialize/api/PreferenceSessionPersister.java
@Override
	public synchronized void delete(Context context, AuthProviderType type) {
		
		SharedPreferences prefs = context.getSharedPreferences(PREFERENCES, Context.MODE_PRIVATE);
		
		String authData = prefs.getString(USER_AUTH_DATA, null);
		
		Editor editor = prefs.edit();
		
		if(!StringUtils.isEmpty(authData)) {
			 UserProviderCredentialsMap map = jsonUtils.fromJSON(authData, UserProviderCredentialsMap.class);
			 
			 map.remove(type);
			 
			 editor.putString(USER_AUTH_DATA, jsonUtils.toJSON(map));
		}
		else {
			editor.putString(USER_AUTH_DATA, jsonUtils.toJSON(makeDefaultUserProviderCredentials()));
		}
		
		editor.commit();
	}
@Override
	public synchronized void delete(Context context, AuthProviderType type) {
		
		SharedPreferences prefs = context.getSharedPreferences(PREFERENCES, Context.MODE_PRIVATE);
		
		String authData = prefs.getString(USER_AUTH_DATA, null);
		
		Editor editor = prefs.edit();
		
		if(!StringUtils.isEmpty(authData)) {
			 UserProviderCredentialsMap map = jsonUtils.fromJSON(authData, UserProviderCredentialsMap.class);
			 
			 map.remove(type);
			 
			 editor.putString(USER_AUTH_DATA, jsonUtils.toJSON(map));
		}
		else {
			editor.putString(USER_AUTH_DATA, jsonUtils.toJSON(makeDefaultUserProviderCredentials()));
		}
		
		editor.commit();
	}
/*
(non-Javadoc)
@see com.socialize.api.SocializeSessionPersister#delete(android.content.Context, com.socialize.auth.AuthProviderType)