OK I have to apologise for the title, but I used to be a teacher and I know we love to tell others what to do!

And you will get those comments that are designed to show what they know and not necessarily support your work - but that's OK.

So as an example - I write a blog post based around a photograph I took, of an amazing sunset and my aim is to initiate debate on inspirational photography and images. The comment I receive -

'I always a Canon Digital blah blah blah camera and I find this is the best way to take photographs without using a zoom'

So I'm thrown a curve ball slightly, this is not quite what I had in mind as a conversation but he has a point (probably). What strikes me is that there will be plenty of people also asking how can I take a photo like this, what do professional photographers do etc..? so my response is

'Hi thanks for the comment I believe the Canon blah blah is great although I haven't been fortunate enough to try it out yet. This particular photo was only taken with an ordinary iPhone luckily the background and colours were so vivid this worked out great. ......

And then I have a choice, if I am reviewing digital photography equipment then I can lead them to that page, if I'm not and have no intention of then a quick google search can link me to a photography equipment page. Or if I'm on Amazon (they sell everything) get them to visit the link to that product through your amazon account.

In other words use everything to your own advantage, direct your readers and get them to engage it is not necessarily only about engagement with the person who writes the comment.