If you take Facebook, you are right in suggesting that the whole experience is very centric about you, It's about your photos, what you are doing and events that you are going to.
Twitter is very much different as it's not about you but everyone else. Like a traditional blog, you're writing content that interests your audience. This is a difference many people don't pick up on.
Do you use this twitter on your mobile as well?
You know, like technology and stuff. I would add blogs like engagets twitter, but I don't see the point when they have an rss feed for their posts anywho...
And lol I just logged into my twitter for the first time in about over a month and in that updateless time i've gained 14 followers... Eh?
I haven't read all this thread but.
Your line "Why people use Twitter? What motivates people to use Twitter? Any ideas? It’s about news or comments?"
Stick it in google and you get loads of sites with the exact same sentience all made by the same username