If you want to make your social content more accessible, you can use alternative tags -- also known as alt-text. Your alt-text will enable screen-reading tools to tell visually impaired people about your images.
Once you've uploaded an image (or more) to Agorapulse, hover on the thumbnail, click the 3 dots and then click Alt-text. On the pop-up screen, enter the alt-text.
The feature is available for LinkedIn (single posts only) as well as Facebook and Twitter. On LinkedIn, you're able to add up to 120 characters, on Twitter the limit is 1000 characters.