Hide private links into public URLs.
Ok, you want to send to your husband a link to the last toy you found in amazon, but he is at work and you suspect there are people always looking at the messages of the others. You are very jealous with privacy and want to keep this stuff away from external eyes, then you google for "hide link". The result is different services, the majority of them URL shorteners like crop.is or goo.gl. You try them but you realize they are not hiding your link. Yes, they assign a different name but anyone can recognize it is a fake link and even can click on it and discover the secret cause this link are just an alias of the real one.
Here is the real solution, follow me. Suppose you and your husband did this other times before. Then now you will repeat the same operation: find a link to a neutral content, like a cooking video. Put both links on the input of this tool, the secret and the inoffensive links, and you will get a third link which is pretty much like the cooking link, actually it is the same link, it keeps pointing to the same address, but inside of a dead zone of the structure of the link it contains the information of the secret one.
Then you send to your husband the output link. Your husband opens it and finds the cooking video. Immediately he realize there is something more you want to tell him cause you hate to cook, then he comes here to this site and unmask the link, as usual, and open the object you really want to share with him. And you keep privacy, because if someone in the office open that link will find the cooking video, and will never suspect what is behind it.