Reader2Twitter uses Google's great service, App Engine. It will cost nothing to develop an app on this platform, unless your app reach the quota. For an App Engine app, the free quota for datastore is 1GB, which is huge for a small app. Reader2Twitter was once a small app and it was just for me :) And I made it public, so you can use it now. But with the growing of users, the datastore is increasing. Here is the figure of datastore usage for R2T:

As you can see, the app has reached the free quota. So I need to pay for the datastore. However, as a Chinese, I cannot use the payment system by Google. China mainland is not in the list of paying countries. And Google tells me that there is no solution for this currently. So I am now trying my best to deal with such a problem. Sorry for the inconvenience and R2T will not work until I solve it.

Here is two ways for me to solve the problem:

1.Try to pay the cost

I am trying to apply for a HongKong visa card to use Google Checkout

2.Opensource the app

If time permitted, I will opensource the app.

That's all I want to let you know :)