But it should soon become overwhelming if you have a lot of content coming in. If you want to have a glance at all your saved quotes, let's say, you have to expand into each mail to read them even if they are just 2-3 lines.
I can see how this works nicely for half-baked ideas in mind. You can simple reply to the thread each time you have more points.
Those algos, ideally should weigh the twitter handle. Or else it's a stupid algo.
One need to spam through authoritative handles.
Pretty much like tricking google ranking algorithm with site-farms and fake backlinks. But hey, a lot of people were able to do this before Google started to improve its algo.
1. Most of the market at that point is filled with 'get-rich-quick' people.
2. It's not regulated and can be gamed like above.
(I understand that not being regulated is also it's biggest selling point)
It's probably like a great social network totally filled with 'tag-your-friend' posts.