In order to better answer this question, we'll need some clarification on the goal/project.

DO you mean the 100 question and dev is the project or the channel to raise the fund?

What's the difference? The channel would mean it is the marketing method in which you raise the fund meaning that the project may be a different thing altogether.

As to method of delivery, depends if you are taking into consideration time and development costs. A PDF have minimal need for dev, while a website can be put together easily with readily available blogging CMS such as wordpress, but your mobile app has a significant amount of technical requirements from UI to functionality coding.

Also, consider HOW you plan to raise the funds? Are you asking for donations? banking on adsense revenue? selling ad space? or even selling an ebook? All of which needs to be considered in order to better decide which medium to deliver it with.

Hopefully this helps, glad to have a call to discuss more.