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Since many of our products and services are purpose-built for a niche community, I find that many of the keywords I am researching are all low-volume. Data on the Keyword Difficulty Tool show '0' under Bing Search Volume (exact match). I know what my competitors are targeting based on their title tags and web content, but I'm not sure if they did their keyword research homework, so I don't want to assume. Is there any other way to determine which keywords I should be targeting?

When giving presentations in our industry, we often find that the PDF or PPT document is then hosted on the origination's domain for download by event attendees. If these files have links, do they count as inbound followed links?