What to do with someone who owes you money?

In March I bought four concert tickets, three of which were for friends because they had no home internet to be online when they went on sale. I knew it was risky then, especially since I wasn't getting paid straight away due to being away at uni.

Well two of them paid me on the day of the concert but the other text me a couple of weeks earlier asking if he could wait until his pay day shortly afterwards. That day came but he just gave an excuse, that was early June. I had to go back to uni a few days later so I put the matter on hold until I got back for the summer in early July. So I asked him again on Facebook in early July and he replied saying he'd sort it for me and that was all he said. It's now August and I've heard nothing from him.

I don't consider this guy a friend, more of an acquaintance. I wasn't keen on buying his ticket at the time but I didn't want to deny my friend's BF from seeing his favourite artist. I thought I'd do the others in the group a favour. I never see this guy, he's split up with my friend and while they're still friends it's unlikely I'll see him again unless randomly or to give me the money.

So what do you people suggest I do? It pisses me off that he's working fulltime, yet I'm currently unemployed and he is just being a dick about this. He owes me £74 which is a lot when you aren't working. I've told him that but he doesn't seem to care.

I don't plan to do anything illegal and it's unlikely I could take him to a small claims court as the only evidence that he owes me anything is in texts or Facebook messages. What should I say to this guy?

Break his legs!

In before...
http://video.yahoo.com/watch/5250278/13853618

Say you need the money by a week tomorrow and that if you have not recieved it by then you're going to have no choice but to use more formal means of getting the money back.

I think that's what it will come to. But I figure I should contact him one last time before moving to that level. I've been patient about it all so far. Kinda looking for something to say between what you suggest and being nice.

Something like.. Sorry to go on, but I need some money for X and I am running low at the moment, you still owe me that £70 from ages ago and its dragging on a bit now.. could you get it to me in the next week?