Twitter section:
2nd paragraph 3rd sentence "This was the first and probably most integral reason why Twitter failed and has failed as much as it has" I would strike this sentence. You already say "first and foremost" in the first sentence, and twitter is still ubiquitous, so to say that it's a failure lacks meaning.
3rd paragraph, 2nd sentence: "If it wasn't enough that all individual posts had to be only 140/280 chars. in length..." strike this. You just finished with this point, no need to bring it up again. Also, the less numbers you have to pronounce, the better.
You can add some stuff about "blue checkmarks" to your final paragraph, as this ties in with using real names.
If you want, you can also talk about the concept of blocking, and block bots.