This is one of the best thing that has ever happened in app world
This app is so useful, you can do anything and search for any content on youtube and it will give you the results.
Using youtube you can earn money. You can make a video and upload on youtube and earn a good amount of money. Although it takes time to get famous and get traffic on you video but with the right marketing strategy and patience you can do it.
I use this app for learning purpose.
I watch ted talks ( highly recommended)
I watch comedy vines
You name a category and it will show you the results.