The Next Web has an article about the Windows 8 Twitter client Tweetro. Tweetro has become so popular among the users that it has had to face the wrath of Twitter.
Thank you for reaching out to get clarification on our developer policies. As you know, we discourage developers from building apps that replicate our core user experience (aka “Twitter clients”).
It’s like when you introduce someone to your circle of friends and then that someone becomes more popular than you in the circle, so you become jealous and want that someone out. Ugh.