Even if you have a good password for your computer or an online service, it can still be compromised by physical (someone watches you) or technical (key logger) means.
Build a mechanism that allows you to specify two or more passwords for the same account (making sure all of them are good and hard to crack.) Each time you can use any of them except the last one you used. This way if you have been compromised the password thief will still not be able to log in. If you use 3 or more passwords, it will be even safer.
Many times you want to link from your web page to an external source or related page, but you have multiple such sources or related pages connected to the same word or phrase.
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.