If you are a businessman you can market your brands on twitter also.Twitter is one of the best places to market your products.use a lead capture strategy to get more costumers.
Click HD photos of your products and make your brand valuable for people.Insert a clickable link to your website where you are selling your products.
There are many companies which offer sponsored posts to tweet.You can contact them to get sponsored posts.You will be given links which may include ads or something else.When your followers will click on ads you will be paid.
Ad.ly,twittad,twitpub are some of the best sites which offer sponsored posts.You just have to sign up and you can select any post from available ad posts.
SEND TRAFFIC TO YOUR WEBSITE/BLOG:
This is an indirect way to earn money with the twitter account.You can send a huge traffic to your website or blog by using this social networking site.
You can tweet a link to your website or blog with your followers.It will increase your website traffic.If you have Google Adsense approved website that means more clicks on the site and more earning.