in France, it's click to subscribe, send a physical hand written letter with signature using a tracking number, and you have to do this the right time( usually 2 months before the anniversary), if you miss it, you have to wait another year.
why doesn't twitter create this feature ?! it my be easy to just follow up the replies on every tweet and the read the hole content at the same time, not bit by bit to the point where you forget where you were.
I remember meeting him in Algeria, where he gave a speak on various economic data of every country and the expected changes in the future with some focus on Africa, it was such an inspiring speech, he has a way to make the data come alive.