For rich link previews, OpenGraph[0] is much more often supported than JSON-LD.
For seo purpose, the kind of JSON-LD a search engine will support is very specific and limited. You are far better consulting the targetted search engine's documentation (Google[1], Bing[2]) and following that. Anything else is a waste of time.
Outside of search engines, again, without a specific purpose, JSON-LD is mostly useless. If you have a specific need that requires JSON-LD, go ahead and include the data you know will be useful. Including anything else is like shouting into the void.
IndieWeb[3] does use structured data but considers JSON-LD a DRY violation and uses Microformats[4] instead.
Old Slashdot had the right ideas. You could mark anyone as friend or foe. If somone marked you as friend, it was your fan. If someone marked you as foe, it was your freak. Then you could make your friends', foes', fans' and freaks' posts more or less visible, as you wished.
There was no "like" for posts but a much more evolved system: you could brand posts as interresting, informative, insightful, funny, underrated, overrated, flamebait or troll.
Slashdot was never a social media, but it sure had a few features that could have been used to turn it into an interresting one.
Why does low birth rates need solution? Low birth rates are already the solution to countless issue like ressources depletion, climate changes and real estate high cost.
You could do a bit better with a 4x5 font for every characters except M, W, m, and w which would be 5x5 but use the pixels normaly used to separate them from the next character, so every caracters still use the same width.
On paper, there is no Canadian PM. The Constitution reads: "The Executive Government and Authority of and over Canada is hereby declared to continue and be vested in the Queen." The existence of a Prime Minister and the fact executive powers are delegated to them are customary.
A Trump-like actor in Canada would do far less damage than in USA. There is no position they could held that would give them the power to do lot of damage. The Queen (nowaday King) has no power. If they tried to use it's constitutional powers as written they would be laughed out. The Governor General, who may act on behalf of the Queen would be laughed out too if they tried to take any decision. The Prime Minister seems all powerful but they are one motion from the House of Common from being overthrown. When one's become POTUS, they are basically POTUS until the end of their term. The exception is impeachment which is a very complicated process that never worked. In Canada, the House of Common can simply vote the Prime Minister out. The Prime Minister is very powerful, I agree, but only as long as they behave.
I tried to look at the charts for Canada. The result may be representative for English Canada but Canada is really two markets. There is English Canada and French Canada, and both listen to very different music, with different charts. Belgium and Switzerland are probably the same.
Most child of every generation don't care about those things. Most of the few that cared about the C64 just used it to play game. You are in the minority who got interested in the C64 and the minority within that minority who also was interested with BASIC. It's good you tried with your kids but the odds were against you.
Meanwhile, some other kid in your area probably got scolded for installing F-Droid. Oh well...
> not a single novelist has realized that such a singularity would almost surely be preceded by a world in which machines are 0.01% intelligent (say), and in which millions of real people would be able to interact with them freely at essentially no cost.
Aren't Asimov's Multivac stories basicaly this? Humans build a powerful computer with a conversational interface helping them doing all kind of science and stuff, then before they know they become Multivac's pets.