The widespread application that people are looking for is Bitfortip. They need Bitcoin to use it and it gives a nice use case. Give it a try and search for the smartphone application.

https://www.youtube.com/watch?v=62iDBVDlhIU

Some use case examples:

Find a item (i.e. a dress ) that you saw on a magazine,website, Pinterest or Instagram and you don’t know where to buy it online. You can upload it as photo using your smartphone and ask bitfortip members to search it online for you in order to win the bitcoin reward.

Find a better price for an item that you want. Offer a small Bitcoin reward for members to search for you online.

Find a piece of information on the internet that you can’t find on your own. Post an inquiry along with a bitcoin reward for people to find you a certain link, image, e.t.c.

When you sign up, a unique bitcoin address is generated in your account. There it shows you the following message: Before you can submit an inquiry you need to fund your account with at least with 0.0001 Bitcoin to give as a reward. After you fund your account, you can post an inquiry with a bitcoin reward of your choice.