I think that's a great idea and another steemian is also thinking about it. Check out the conversation here: https://steemit.com/technology/@lextenebris/programming-beginning-the-search-for-discovery

Essentially, I think there are many different recommendation algorithms and potential UIs. How would you like to use a tool like that? Would it be a separate webpage that would just show 100 recommendations or would it be a bot that tagged you when it thinks you'll like something?