Like polls on LinkedIn (or any other social media site), the odds of getting responses increase with the size of your social network. However, there are ways that you can increase the probability of a reply. You can add the hashtag #poll or #twitterpoll to a post; the hash groups tweets, makes them easy for people to find. Or you can turn to an external aide; for example, PollDaddy has a Twitter poll feature.
More good stuff if you’re still trying to figure out how to use Twitter: Paul Bradshaw just wrote a post about how journalists are using (can use) Twitter. Of course, as I wrote earlier this month, I’m working on Twitter genres (another way to analyze how people are using the tool).