You can make a stronger case for social media by incorporating data into your decision-making process. See the Social Media Statistics section of this guide for resources.
Nearly 80% of adults 18 and older are online. Libraries are being innundated by people who need Internet access to research and apply for jobs or apply for government assistance. Teens are even more connected. 93% use the internet. This graph, from the The Pew Internet and American Life Project, illustrates the change in Internet usage in the last decade.
Furthermore, people are using social media to share content. Some statistics:
Pew Internet's Generations Online 2010 summary of findings illustrates the popularity of internet activities by internet users in each generation. Some highlights:
The internet has become deeply embedded in group life and is affecting the way civic and social groups behave and the way they impact their communities. Pew Internet has correlated information about group affilation and connectivity to show the percentage of American adults in each tech user group (those who use the internet, those who connect to the internet wirelessly, cell phone users, etc.) who are active in various organizations. You can view the chart here.
Social Media and the Workplace as explained by Common Craft is an excellent video introduction to why social media is important for companies. It works equally well for non-commercial organizations too.
What are some of the benefits of social media?
The bottom line: Social media is another avenue for telling your organization's story and finding a wider audience for your web content. Why would you not use free marketing tools?