Siz.io is a free web app which allows you to collect your favorite video clips into thematic "shortlists".

Shortlists are organized into main categories ranging from News, to Animals, Games, Funny, Cinema, TV and more.

You can add video clips from YouTube, Vimeo, DailyMotion, Instagram, Vines and more by simply copying and pasting their URLs.

My comment: Good resource to find shortlists of curious, funny and entertaining videos. Easy-to-use. Feature request: play all clips in a shortlist as a back-to-back sequence.

Free to use.

Try it out now: http://siz.io/ 

Added to the section: Video Curation of the Content Curation Tools Supermap