Learn and have fun.
An augmented reality app. When you see something while walking that you think is interesting, or you know an interesting fact about it, maybe you discovered something, etc., you just launch the app, point the camera at the object and annotate it with your insight. You can also check and see what others have contributed regarding this object or other objects around you (buildings, signs, flowers, etc.)
You know they are a useful in influencing your audience. Why not take it a step further?!
Instead of just using a short quote from a happy customer, build a whole subsite for your best ones. In their own blog (running under your domain), they can have a place where they can tell their own story and how it connects to your product and their success and happiness – help them express themselves. Give them this platform and help them create the content. Interview them (preferably on video) and use the materials to create blog posts, audio file and video clips that will show both you (and your brand) and them in a good light.
You already have many friends online taking pictures and sharing them on multiple platforms. Getting a daily digest of them all would be good.
A service that connects to your friends’ photo feeds on all the platforms they share on, collects all the previous day’s photos, intelligently arranges them while also eliminating duplicates (and keeping the ones on the major platform they use), and presenting them as a digest. You can respond the each one you want, and it will be pushed to the right platform where they originated.
You have an idea. Why not quickly put it out there and have others help you shape and develop it? It’s fun, stimulating and rewarding. You could even find collaborators to help execute on it, or maybe sell it when fully developed.
An idea publication website. Make it easy to publish your idea. Others will see it, rate it, and some will join in and help you shape and develop it. There could be a marketplace for buying these ideas, and a whole system for helping to execute them (finding funding, collaborators, etc.)
Make it easy to vote on anything.
Have a platform where a user can create yes/no questions to have people vote on.