When Twitter is used to promote your online business, you have to be willing to be open and honest with your followers and make friends with them.
In order to become more acquainted with them, you should be willing to be contacted by them if they have an issue to discuss.
To encourage interaction, you will have to be prepared to reset the privacy settings of your Twitter site to allow your users open access to your homepage.
Without sending mixed signals that the relationship is only one-way, you do not want them to get the feelings of the following:

• You have all the access to them
• They have limited information on who you are and what you do

It makes it a more open relationship.
It turns off potential customers when they feel they are being selected and screened out of social media.
All the more, it becomes important to create a business profile which is inviting and approachable.
It is a social networking site which caters more to micro-blogging, so just be comprehensive in your approach without bombarding people with so many ideas all at one time.
You can always treat your followers with short, casual updates every now and then or with a great photo or short video of your latest product soon to be launched or sold on promo.
Make your followers feel like you can talk about anything under the sun, and it does not necessarily always have be all about making sales.
Encourage people to buy in your own friendly and persuasive manner without being too overbearing and demanding.
Pressure does not go well with Twitter as a social media.
Instead of dwelling on how to make money using social media all of the time, focus on how to make an initial and lasting impression that counts.
That's what makes your initial list of followers a wealth of potential buyers and loyal customers.