+The [abstract] element is not working with connectors where we post HTML directly, like Tumblr, Wordpress or Pump.io.
+For the native connections--that is to e.g. Friendica, Hubzilla, Diaspora or GNU Social--the full posting is used and the contacts instance will display the posting as desired.
+
+For postings that are delivered via ActivityPub, the text from the abstract is placed in the summary field.
+On Mastodon this field is used for the content warning.