My instance ended up with no DNS resolution
nslookup facebook.com
dig +trace facebook.com
didn't work :(
So updated resolv.conf to the following:
search ec2.internal
nameserver 8.8.8.8
nameserver 8.8.4.4
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_DHCP_Options.html
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_DHCP_Options.html#AmazonDNS