I didn't realise I had to scroll this up to see videos I had sent, and so I thought it was broken. From a usability point of view, starting the bar at the right hand side, showing everything, and scaling the list back when you slide left would be much better in terms of educating your users.

Also, Instapaper nailed it with the "Saving ..." > "Saved!" language in the book mark. If you are using the name, go the whole hog and copy that - the feedback to the user that it is safely stashed on the Insta~ servers is invaluable.