Why now to twitter, and why not earlier? After twitter increased post size from previous 128 bytes to 256, things got easier there. And meaningful posts can be published without much summarization. Plus the Trump effect. All diplomacy are now on Twitter.
My English got a bit rusty over the years as focus went too much in learning Arabic and didn't care about English, but a few days of practice and it seems am up and moving.
The switch isn't new. And I had to made a lot of platform changes over the decades.
Now I am on FB. Prior to that Somewherein blog, preceded by yahoo mailing lists, preceded by reddit, before that fark, before that digg, before that slashdot.
Not to forget the first one -- IRC chat in mid 90s.
The lesson? First task on any new platform - You need to select your friends and circle wisely, as you will then be defined by your friends.