Welcome to the Q&A Forum

I think you need to look for a tool that allows you to block certain terms such as "buy" "$" "pay" etc and then look for the term your looking for. www.mention.net might have what your looking for however its downside is you can only have 5 negative keywords per phrase. I tried other software but without negative keywords you just get a lot of spam. I'll be interested in other's recommendations.

If I built  log network for my own personal use(no link selling) would this be a white hat or blackhat thing? The content would be hand written, but the link won't always be relevant to the niche. Can anyone offer some insight?