Even though Twitter is really a very informal tool, be careful of what you say. Especially if you desire to use it as a professional tool. Tweets can be read because of your customers, partners and workers. I do market other programs that aren't residual, but i find these kinds of are 1 time purchases. You may not see that customer again. However, residual income, which is also called passive income, is better because a person get that customer as well as the customer is content with the prod...