Last week I offered advice to small business owners on 10 things you should tweet to build your brand and connect with customers.

Now let's look at the other side of the coin. When businesses use Twitter poorly and broadcast stupid messages (140 characters at a time), they damage their reputations, their brands, and their bottom line.

So here are 10 things to avoid at all costs when using Twitter as a marketing/branding tool:

1. The "my competitors stink" tweet:

You do not want to start battles with your competitors on Twitter. It will only lead to mutual bashing across a wide range of social media platforms. The result? When people Google your business, they are going to find a whole lot of nasty comments about you and/or your company.