For you SF fans who have no lives. 
@robinson_spider
Harry Turtledove: @HNTurtledove
I’d rather see him at his computer working on a new book.
I have added him. 
Thank you for the head’s up.
He tweets puns!!! I am so happy.
I have Robinson’s autograph on two books, and he actually wrote back to me once, many years ago, after I snail mailed him with a question.
When he signed those books he was appearing at a bookstore in East Lansing, Michigan. I so wanted to talk to him more, but was too tongue-tied at the idea of meeting one of my very favorite authors.