Since Twitter is a great of communicating to not only your follower but also other people, many people turn to Twitter in case they seem to have an answer and cannot find it somewhere else. You can especially get your questions answered on Twitter if you have a problem with a product or service and the company is monitoring conversations about that on Twitter.
In case you want your question answered on Twitter, you can either simply post it on Twitter, or you can use these 5 Twitter services reviewed at Mashable.
