Rosie - try out YouTube. It's not perfect, by a long way, but comment (and even lack of comment) from perfect strangers can be interesting. You can always delete the weird or abusive comments, should you get any (which I doubt).

I once spent just a few minutes putting together what I still think is a very, very amateur video on playing simple blues licks in the key of A. I posted it on YouTube over a year ago and virtually forgot about it. In spite of my inceased proficiency in making music videos, that video still has had more hits (105,432 to date) than any other video I've posted there. I still think it's very average - but it did show me what some people on YouTube were looking out for, and that can be valuable. You can judge for yourself at: Blues Licks In A.

The fact that what I consider to be a very ordinary amateur video can get so much attention may not, of course, actually say very much for the critical faculty of YouTubers!