If the latter is what you want, though, you have to think about how do you prevent people from gaming the system to learn about you. For example, you (you being a user of whatever system you might set up) may not want people hitting on you based on your github profile.
As an aside, a quick google search brought up http://lamakerspace.com/
There are a few hacker spaces in LA, I need to venture there sometime to meet up, it's just kind of more difficult than what I am thinking of because you have to drive there, find parking, etc. I'm basically thinking about networking with people in my neighborhood. For instance there is an awesome coffee shop around the corner that I always hang out and hack at because it's walking distance from my place. I also know there are a lot of hackers in my neighborhood, it's just hard to find them. It would be cool if I could set a status as "come hack with me" set my location on a map, and put it up for others to see so they can come hang out. Likewise others could do the same. So if I'm at home messing around, and I see there is a hacker close by who wants to hang out and hack on things somewhere close by, I can roll over to meet him. It would be a good way to network with other hackers in my area and work on cool things together.
You might try looking for local meetups and meeting people there: - http://www.2600.com/meetings/mtg.html - http://meetup.com
I have tried the meetups before, but I'd like something for more spur of the moment hacking.