Also, what are all the "entitytype" options? I looked up a questionid that a user reported in their updates, it lists 3 rows but none have their userid. The first row has the question-asker's id (3836), with a lstuserid of 1 (me) since I edited the question. Then there are two rows with T as the entitytype and lastuserid as the OP (3836).
Edit: now the question has been answered and there are 11 rows in total, with a bunch of users listed (now including the one who reported the problem).