If you are a writer working on your platform and you decide to add Twitter to it there are some things you are going to want to take into consideration. The wonderful thing about Twitter is that it is like the adult coffee shop version of Facebook. On Twitter you'll find agents, editors, authors, and all manner of publishing industry people, and they'll find you. Be aware of that when you tweet. The image you portray can hurt or help you. Here are some do's and don'ts to help.
Do post something under your bio. People won't follow you if you don't tell them a bit about yourself. Something as simple as 'aspiring author' along with the genre you write will work.
Do upload a picture. It doesn't have to be of you. It can be anything that you feel represents you as a writer. A quill or pen will work.
Do add a link to your blog or website. People are more likely to follow you if they can find out more about you through a blog or website. Plus, it looks good to an agent or editor.
Do be yourself. It's social networking after all and to attract the kind of people you want to hang out with and will work well with (agents, editors) you must be yourself. Just be careful about using profanity or talking politics (unless that's your thing).
Do make your tweets public if you want to draw people to you. Otherwise when someone looks you up they won't be able to see anything about you and they won't be able to follow you.
Don't post knee-jerk responses or tweets. Sometimes people will say things that will get you fired up. Remember, if whatever you say would embarrass you to see on the front page of a newspaper, then you shouldn't say it.
Don't allow a page or application access to your account without checking with someone you know to see if it's trustworthy. There are a lot of application and pages that you can get onto through Twitter that will look legitimate but they aren't. This is how a lot of people get their accounts hacked. Ask one of your friends if a page is legitimate before allowing it access. Such as Tweetchat. If you go onto it you will have to log in and it will ask you if it has permission to access your account. You can hit allow or not allow. Tweetchat is a safe application. There are others that are not.
Don't ignore your followers. Go through and check them when you can. Report and block spammers and check for creepy types. This way you'll know everyone that follows you is a legitimate follower and a solid part of your platform.
Most important, do enjoy yourself. Twitter is a blast and it's filled with the most amazing people I've ever met! Anyone have do's or don'ts?