Just like Quroa, Reddit is overwhelmed by chatbots and spam. As the spammers and chatbots vote up each other's posts and the administrators and moderators can't keep up.
When you load a random content page, the top 50% of the page is a question, the bottom 50% is an ad that is designed to look like a comment, and the entire right panel is ads. Quora is more ads than content, you have to scroll and decipher what is or isn't an ad based on their greyed 2px font ad disclaimer.
