The #1 reason why I moved from Facebook to Twitter was that the latter service used straightforward algoritms for deciding what to show me. When I opened Twitter, I could be almost sure that the timeline would only contain posts from people I followed, arranged in chronological order.
Of course, there were some exceptions. Firstly, they always had ads. I see how many people here get angry about it, but I think ads on such site is perfectly normal. After all, they have to make money somehow, right?
Secondly, there were times when I saw "While you were away" box. This was the thing I found annoying from the beginning. How did Twitter infer that I was interested in these five posts more than in those five posts? It got worse over time. In fact, now this box shows up after a few hours of my absence, as if I am expected to check Twitter 10 times a day.
And it appears that they are planning to take these features to a new level. I really hope they don't do everything they talk about, but if they do, maybe I will have to seek a new social media service.