Jessica Levin is a marketer, event professional and speaker. Jessica is the President and Chief Connector at Seven Degrees Communications. She is well-known for her knowledge of Twitter and can be found @JessicaLevin.
Google+ will grow and will see more adoption in the CPA profession because it has the professional nature that CPAs gravitate to, but the highly social components lacking in their go-to resource, LinkedIn. Firms who have invested in SEO strategies will see high return in Google+. Firms will find that more of their clients will be using Google+. I believe CPAs will adopt Google+ more than they have Twitter because of the familiar Google brand.
CPAs who target certain markets such as retail, apparel or any other market that has a highly visual product should pay attention to Pinterest. While the services of accountants don't lend themselves to visually-driven social networks, they can still add value to discussions and help to promote their clients and prospects. Few will use it as a business tool to begin with, but those who embrace it will see a result.
In general, they all get better at learning where to find relevant content and how to use it, regardless of the platform.