Eh, tossing the direct comparison to Twitter out here because they seem to have gone too far the other way, this is much like saying "I can make 1,000,000 screws a day, so assembling at least 100 cars a day should be easy".
I am not saying that writing twitter like app is easy, but writing it and keeping it running are two different things.
If you are not adding new features, you are just mostly keeping up with Android/Apple platforms, which can be annoying, but not that difficult.