I noticed that 'host google.com' returns a lot of IP addresses. But 'host facebook.com' returns only one. I would have figured both to either use one, or both to use several since they're both incredibly popular.
What's the reason for this?
Edit: Maybe it was a poorly worded question. I was operating under the assumption that services had numerous IP:s for performance reasons. I realize now that multiple IP:s can be because they support multiple protocols, socket types etc.