Crowd-sourcing app enabling Q&A with micro payments

TweetBrain is a crowdsourcing service powered by the Twitter user community. It facilitates people to ask questions, get answers, and earn money from answering questions posted with a reward. It also greatly increases your reach in the Twitter community well beyond your followers.

TweetBrain provides an option to reward the best answers. Payments are handled via PayPal. Answers can be voted up/down, making it a truly open system to get the best answers for the questions you ask.
Best of all, TweetBrain is free to use; for both asking questions and answering them!
twtpoll enables you to create opinion polls/surveys using Twitter. Here is one that you can participate in, specific to Twitdom.