Get the most important points of the book without needing to read it, then read it if you want to dive deeper.
A website that allows anyone to write a summary of a book (non-fiction, business books, or even fiction) using a template of what needs to be in brief. And of course, anyone can read these summaries to get the gist of the book.
You want a new brand name but can’t seem to find a good one.
A service that crowdsources name creation and validation (domain names, trademarks, etc.) You describe what you want and get a list of valid suggestions within a short time.