I usually don't post graphics or pictures created by others, but I felt that this infographic created by http://www.voltierdigital.com/ is a really useful one for everyone who wishes to remain relevant as a brand in the foreseeable future.
Have a look... and in case you are not able to see the infographic properly go to this mashable post where it is very clearly visible - http://mashable.com/2011/10/30/inbound-outbound-marketing/