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Sure, there are people who are following you on Twitter, but since your content doesn't interest them that much, you have no engagement. And this can truely be the death of your otherwise promising social media personae.
There's Tweepi, WeFollow, the targeted hashtag, and other efficient means to increase your number targeted followers. Reaching out with "calls to action" are absolutely vital. These will separate you from the unending stream of news and tidbits.