Not a social media tool, so a bit out of place in this collection of resources. But for those who are creating video via social media this will come in useful. Of course it will be a great help to TV presenters.
From the site: "CuePrompter is a free teleprompter/autocue service. Your browser works like a teleprompter -no extra software needed.
Check the system requirements and give it a try. Bookmark this site and come again when ever you need teleprompter services.
Free for any use (both commercial and non-commercial)."