Social media audience-data provider Optimal, creator of the Optim.al ad management platform, is making some data available to the public free of charge.

Access to Optimal’s Keyword Explorer is now available after registration. Users can enter keywords they wish to explore, and then expand, connect, or remove nodes.

And users can also see the top 15 results for each query from Optimal’s Keyword Expander, which has indexed more than 1.9 million keywords.