Well not only does he build quality products but he's an esteemed member of the mISV and HN community. His blog is popular and very educational.

Creating a product or service which people find valuable enough to purchase is 'making an impact'.

Really? So literally every business activity (e.g. running a small grocery store on the corner) is 'making an impact'? For me, this term implicitly means making SIGNIFICANT impact, not just any impact.

Yes. There was no prior mention of magnitude. I benefit vey greatly from my local grocer, s/he provides with quality goods at a reasonable price -- making an impact on me.

Now, how do you draw the line with 'significance'?

I think it's purely intuitive concept, with no clear definition. But without it, literally every particle in this universe is making an impact.

In other words, it's a hazy and easily misinterpret-able term. No, defining a prerequisite/s instead of relying on an general idea of 'intuitiveness' would be a more appropriate approach.

Everything 'makes an impact' the magnitude of the impact makes all the difference.