If you're not online 24/7 on steemit you will miss your mentions in posts. We have a tab to see "comments", "replies", "rewards" and "blog", but no tab for mentions. You will find your mentions, but only if you're mentioned in a comment, but it seems like there is no place to find your mentions. As for now, you can use this website made by 
I think it would be a good feature to have so we can reward those users who are trying to promote us. It's a great way for users to interact, to keep being updated in certain contests or projects. As for now, projects with a great value for the platform are probably missing out on rewards due to users can't see their mentionings.