I have a Twitter account with a Klout score of 43 and over 600 followers, including some higher-profile figures. I will tweet a message of 140 characters or less about you or your company. This could be to:
Endorse a product
Gain you some more followers
Offer a review of your business or location
Become better-known on Twitter
However, some exclusions do apply, I won't talk extremely negatively of somebody else, promote an illegal product, and a few others, message me if you're not certain.
If you need some help understanding my service, please message me and I'll aim to respond within a few hours.