Ulog to old members on steemit is not a new thing. But for the newbies, its a new thing. Well ulog is a special tag where you when writing about your daily activities.
To make it better they made a steem extension which you can use to post ulogs, teardrops and even normal posts. The best part about ulogs.org is that there is a notification section where you can use to monitor your steemit activities.
You whenever you what to post, you can use ulogs.org