Getting known as a resource on Twitter is pretty straight forward. Simply discuss the topics relevant to your field and people will begin to find you nearly as soon as you post it. With Google’s real time search your comments are indexed almost instantly. All you have to do is join the conversation.
Hashtags is Twitter’s built-in bookmarking system you can use to get your comments out to a wider audience. By using the pound sign in front of a term, it creates a virtual bookmark others can use to find topics about that subject. For example, if you want to discuss your job search, you can use the hashtag #jobs. If you need help with your job search, you can use #jobhelp. There are many hashtags, so before using one do a search on it first. Make sure it's active or else you'll be the only one searching for it.
Active hashtags increase the chances someone will see your comments.