Yes, I tried disabling some of the feeds and an error occurred like this:
Server Error
Mysqli statement execute error : Incorrect string value: '\xF0\x9F\x98\x8D #...' for column 'message' at row 1
Zend_Db_Statement_Mysqli->_execute() in Zend/Db/Statement.php at line 297
Zend_Db_Statement->execute() in Zend/Db/Adapter/Abstract.php at line 479
Zend_Db_Adapter_Abstract->query() in Zend/Db/Adapter/Abstract.php at line 574
Zend_Db_Adapter_Abstract->insert() in XenForo/DataWriter.php at line 1591
XenForo_DataWriter->_insert() in XenForo/DataWriter.php at line 1580
XenForo_DataWriter->_save() in XenForo/DataWriter.php at line 1381
XenForo_DataWriter->save() in XenForo/DataWriter/Discussion.php at line 415
XenForo_DataWriter_Discussion->_saveFirstMessageDw() in XenForo/DataWriter/Discussion.php at line 363
XenForo_DataWriter_Discussion->_postSave() in XenForo/DataWriter.php at line 1385
XenForo_DataWriter->save() in XenForo/Model/Feed.php at line 468
XenForo_Model_Feed->_insertFeedEntry() in XenForo/Model/Feed.php at line 511
XenForo_Model_Feed->_insertFeedData() in XenForo/Model/Feed.php at line 538
XenForo_Model_Feed->importFeedData() in XenForo/Model/Feed.php at line 548
XenForo_Model_Feed->scheduledImport() in XenForo/CronEntry/Feeder.php at line 15
XenForo_CronEntry_Feeder::importFeeds() in XenForo/Model/Cron.php at line 356
XenForo_Model_Cron->runEntry() in XenForo/ControllerAdmin/Cron.php at line 204
XenForo_ControllerAdmin_Cron->actionRun() in XenForo/FrontController.php at line 310
XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 132
XenForo_FrontController->run() in /home/*******/********.com/admin.php at line 13