Here are my favorite space themed twitter feeds:
Here is the twitter page of the guy who is constantly flying aerial spying missions at the Starship facility in Cocoa Beach:
https://twitter.com/John_Winkopp
Here is the Russian woman who recently went on an amazing tour of a CCCP space museum and who always has a great insider perspective on the back-room politics behind russian space news: https://twitter.com/katlinegrey
Here is DutchSpace, who reblogs a wide range of news, often with interesting opinions: https://twitter.com/DutchSpace
Copenhagen Suborbitals; this twitter is about the only way to keep up with their excruciatingly methodical progress: https://twitter.com/copsub