It's funny, when the web and personal computers first got started, recipes were often cited as the 'killer app' hauled out whenever an enthusiast wanted to explain why regular people would want a machine in their home, or why they'd use the 'net.
Now some 30yrs later, it seems like recipe sites are the harbingers of everything wrong with the web. So many of them are now mostly SEO-laden link-farms, and ad-revenue trash.
@ottaross recipes are still a killer app, it's just the web that has become shittier. You know what remains awesome? Recipe databases and the tools that let you search them with queries like "what can I make in 30 minutes including waiting time" or "what can I make with fresh kale and potatoes".