In recent years, social networking services have enabled many organizations, including nonprofits, to gain a level of visibility they may not have had before. Indeed, back in May, we brought you an infographic which shows the impact that Facebook and Twitter are having on social fundraising. It was revealed that nonprofits who use Twitter consistently beat their fundraising goals. However, how exactly are nonprofits using social networking services?

A new infographic published by Craigconnects — a website run by Craigslist founder Craig Newmark — reveals some interesting details about how the nonprofits with the highest levels of income are engaging with their supporters using social networking services. It was discovered that 92 percent of the top 50 nonprofits’ websites contain at least one social sharing button — 92 percent have Facebook sharing buttons, while 90 percent have a way to share content on Twitter.

Public Broadcasting Service (PBS) has the highest number of Facebook fans among nonprofits: 928,265. It also has the most engaged fans — they made 17,205 comments on PBS posts over the course of 2 months — and the most Twitter followers (840,653). The American Red Cross was the first nonprofit that was included in the analysis to sign up for a Twitter account.

For more stats about how nonprofits are using social networking services, check out the infographic, which you can click to enlarge.