This is different than posting a YouTube video link on Facebook because HeySpread will copy the actual video file from YouTube to Facebook servers, not just like to YouTube as is the case with other YouTube applications for Facebook.
The videos will therefore be streamed via Facebook servers, not YouTube. Each video can be as long as 10 minutes and as large as 200 MB.
What I don't like about Facebook videos is that you cannot embed them in places outside the Facebook ecosystem.
Related: Upload Videos to YouTube When Site is Banned