Currently you can only publish one video at a time to social media.

It is possible to publish multiple videos to social destinations by using Auto Sync with specific tags in the videos.  You can setup a custom tag to use with auto sync and any videos with that tag will get published to that social media destination.  By using auto sync with tags, you can publish the same video to multiple social destinations, and multiple videos can be synced by adding the same tag to each video. More info can be found here: https://studio.support.brightcove.com/social/general/using-auto-sync-synchronize-videos-social-media-accounts.html