This slide from the Web 2.0 conference highlights the three huge and rapidly growing areas where consumers are spending their time. If small businesses don't have a marketing strategy for search, social and mobile they are missing out on the most important places to get awareness and leads from today's digital consumers.
Check out the video. It's 18 minutes of key insights by Mary Meeker on where the market is headed. In my opinion, she is the leading analyst in the space. Well worth the time investment.