News aggregators are never likely to rank well in a search engine and user acquisition costs will always be high. What are some strategies for user acquisition and are there any examples (blogs, news articles, books, etc) that detail some success stories.
What makes your platform different? How does it solve a problem? What makes it unique? Why should people use your service over others? Think these questions through and then work on partnerships. What news sources are you aggregating and why? Reach out to sources, tell them you're featuring them and why. Be a place that all the news is coming together in one place for a REASON