With the ability to communicate more widely through social media, there are more opportunties to reach various groups. What is an effective way that your library uses social media to engage people with disabilities?
The first thing to keep in mind is that a lot of social media sites don't have the best accessibility. Your website is considered an extension of your public entity, which is covered under the ADA - which says your website must be accessible. So you might do a blast on Facebook/Twitter, but due to not having full control over said application you should also house the content on your site and ensure that is accessible. Then link from the social media back to your site.
If you have a special feature about your library, ADVERTISE it! Some examples, you have a "new" computer with various assistive technology, you are bringing in somebody for a disability-related event, you are partnering with bookshare, NFB, etc.