I have extensive plans for a new niche social networking site (nothing like fb or myspace). It will require a google maps kind of interface as well as wiki’s. Also people will need to be able to upload pictures, videos, and have their own mini-blog on the site.
Any suggestions for any of these components?

I do this sort of thing for a living. You need money. Those are NOT cheap. In order for you to get what you want in it, you need some programmers and designers to build it for you. Search the web for some web programming services to get in touch with. Create an RFP and submit it to some businesses. Basically, unless you are an incredible programmer, you need some help.