KickStarter is one of the more popular micro-investor/social websites. I hadn't been there in a long time when I noticed that some of the traffic coming to this blog came from there. For those of you that don't know what a micro-investor site is, it's a place where people can propose a project (usually commercial) and ask for pledges from individual investors (like you) to raise the money necessary to complete it. On Kickstarter, when you offer a project, you set a predetermined amount of money needed for it and an end date to collect the pledges. If you don't get enough pledges by the end date, the project is over and no money changes hands. But, if the pledges total more than the necessary $$$ needed, all the money is forwarded to the person creating the project and you usually get something (some token based on your pledge level) in return.
This link shows all the project currently looking for money that have the word "arcade" in their description, it is an interesting variety of stuff...
Oh, and by the way, the reason I got traffic to the blog from there is that one of the projects mentions my site as a reference on arcade games.
I haven't read many of the projects and haven't pledged any, so I can't endorse or recommend any - but the concept and opportunity to raise funds this way is a very cool use of the web.