How do people know you're asking them a question on twitter?

[false pretense]

I see people answer other people's tweets and I was wondering how to do that.
I've been posting @[username] with questions/comments or whatever, but get nothing. Is there another step so that the person gets the question/comment? Or am i just not having luck??
thanks

[livelysummer732]

If your account is set to private those people who aren't following you will not see your tweets. For example: my tweets are private and I'm following Oprah, but she's not following me. If I send her a message like this @Oprah Hi there! she will not receive my message. Another reason why no one is answering you is because they simply don't want to. I don't mean that to sound harsh but I ask celebs questions all the time and no one answers me either. Guess neither of us have luck! lol Hope this helps.