I'm being impersonated

Someone is using my account name and picture posing as me. His profile is here
http://steamcommunity.com/profiles/76561198120866726/

This is my profile
http://steamcommunity.com/id/infernojo3117

I am unsure if this guy is just trolling or using my reputation to scam people.
People know me from my Youtube channel. https://www.youtube.com/user/infernojo3117
If you have received a message from someone posing as me it is not me.
How should i go about this? He does not reply to my questions and has yet to change his name.
He has used my name before when i checked his previous aliases (8th down the list "infernojo3117")
What should i do?

*Edit* He has since changed his name. Which i am assuming is a good thing

Make a report here. http://forums.steamrep.com/forms/scam-report.2/respond
Provide all evidence that you have and I will look at it for you.

Hello,

I'm being impersonated as well, as you can see here: http://steamcommunity.com/search/users/#filter=users&text=tohico

The reports requires evidence, like a screenshot of the conversation. I obviously don't have it, a person he's trying to scam will have that. So my question is, is it worth a short of reporting them here or should I just wait till someone gets scammed while hoping they'll report him here? Since those are all private and new profiles created with my name ("tohico" doesn't mean anything, i made it up) and with mine avatar (no one knows this picture these days), so we can pretty much say what they're up to...

Best to report them before they scam somebody. If you believe they are trying to scam or abuse your reputation and good name, then create a report.

Okay, thank you for your reply. I wasn't sure whether I can post it without the screenshot. Also, may I report them all at once or should I make a report for each impersonator?

If there's multiple people impersonating you, you could probably just make one report to save everyone time.

Okay, I'll make it right away. Thank you