There are two terrible web properties out there that everyone hates, Scribd and Quora. Please don’t use them. Instead of Scribd just host a PDF anywhere, or upload text to pastebin or make a nice blog on WordPress or Medium or something. And instead of Quora use Ask MetaFilter or StackExchange.
Quora’s business model is to trick people into sharing information for free, then put it behind a login. It’s like Experts Exchange 2.0! For instance, on Quora you can read Who owns the copyright on content contributed to Quora? Only you can’t just read the text. Depending on your history with the site and the way you got there you may see a giant popup demanding you log in obscuring the page, or the first answer clear and then the rest blurred, or if you're lucky just the page. It appears nondeterministic.
Both businesses are deliberately trying to lock up text content to make it harder to access, to force users to pay or share advertising data or some such bullshit. The part that kills me is some engineer actually wrote code to deliberately break document sharing on the web. It’s terrible.
Update: the Quora CEO responded on Hacker News to correct me that Quora neither runs ads nor charges users. At the moment, they apparently have no revenue.