While a lot of the smaller startups like Foursquare and Gowalla are getting much of the buzz at SXSW, Twitter isn’t sitting idly on the location sidelines. Sure, they launched location integration on their site a few days ago, but they’ve also apparently set up a sub-site totally around location for SXSW. But here’s the weird thing: It’s only for stalking their employees.

As co-founder Evan Williams tweeted out earlier, sxsw.twitter.com shows you a Google map of Austin, Texas (where SXSW is held) with tiny Twitter logos overlaid on it, showing Twitter employees at the conference tweeting.

The site, which is clearly tailored for mobile usage (it looks great on the iPhone, for example), has two areas: “Twitter People” and “To Meet.” The Twitter People area is the one that shows the map and the tweets overlaid on it. The To Meet area is interesting because it asks, “Which of these sound like awesome things to work on?” and gives you a few different options to click on.

For example, if you click on, “Making fast and sexy applications” it takes you to a list of various Twitter employees at SXSW that you should meet. If you click on “Partnering with Twitter,” you get a different list. Clearly, Twitter is using this site for both new employee recruitment, platform expansion, and partnership opportunities.

Twitter, while now fairly commonplace in the mainstream (especially the media), first rose to fame among early tech adopters during SXSW three years ago.

As I’ve made abundantly clear over the past several days, just about every service that has anything to do with location is launching something at the SXSW festival which starts tomorrow in Austin, Texas. Don’t believe me, here’s a small sampling (Foursquare, Gowalla, Loopt, Whrrl, Plancast, Brizzly, Twitter). So, how are you going to wrap your head around all this location data? SimpleGeo has an awesome way.

Vicarious.ly is a real-time location-based stream of information presented in a nice visual way. While the plan is to eventually launch one for many different cities around the U.S. and eventually the world, the first one is based around Austin, for SXSW. To make it, SimpleGeo partnered with BlockChalk, Brightkite, Bump Technologies, Flickr, Fwix, Foursquare, Gowalla, and Twitter to pull all of their location data and place it both in a constantly-updating stream, and put data points on a Google Map at the top of the page. These data points are represented by the logos of the various companies, so it’s easy to follow visually.

Those concerned about the privacy implications of this need not worry, Vicarious.ly doesn’t pull actual user names from the companies mentioned above. Instead, they simply note that “someone” checked-in at a venue. They do, however, give the venue name, which is a hyperlink. So if someone just checked into Stubb’s Bar-B-Q in Austin on Gowalla, you’ll see a link back to the Gowalla page for that venue. Likewise, if someone uploads a geotagged picture to Flickr, you’ll see a thumbnail of the picture in Vicarious.ly’s stream, and clicking on it will take you to that picture’s Flickr page.

It’s fairly amazing to see just how much activity there is even today, the day before the conference starts. Tomorrow and the weekend should be insane. “The amount of real-time, location-based information we’re indexing is staggering.  We wanted a powerful way to showcase that, so we built Vicarious.ly and targeted the launch to coincide with a massive gathering of geeks,” co-founder Matt Galligan says about the project.

You’ll note just how much of the activity are check-ins from either Foursquare or Gowalla. Those two are likely to be the two main competitors in the location war that will take place this weekend. (If you’re surprised not to see tweets in the stream, it’s a bug that SimpleGeo hopes to squash tonight).

For more on SimpleGeo, which has a powerful set of tools to easily provide geolocation infrastructure for other companies (such as the new hot startup, StickyBits), check out this and this.

What this means is that anytime someone in your tweet stream sends out a tweet from Foursquare (which, to the annoyance of some users, happens automatically at times), that Foursquare link (shown as a 4sq.com URL) will be able to be opened in Tweetie in a way that displays the location information in a nice format. When a tweet is eligible for this feature, you’ll see a purple square logo in the upper right hand corner of the tweet in Tweetie.

When you click on a Foursquare link, you’ll be taken to a page that shows the venue’s address and phone number as well as the Foursquare mayor of the place. If you click on the address you’ll load a Google Map showing you exactly where it is. If you click on the phone number, you’ll be able to call the place right from the iPhone. Below all of that, there is a button to open the venue in Foursquare, which launches the Foursquare iPhone app.

A couple other new features in Tweetie 2 include Vodpod video uploads and the ability to attach messages along with your TwitPics to that service.

Look for this Tweetie 2 update soon in the App Store (it will be version 2.1.1). Meanwhile, Tweetie Two for Mac should be released in a private beta in about a month, according to new info shared on MacHeist today. Tweetie for Mac will soon be added to the nanoBundle 2, and in anticipation, they’ve added this message:

As a MacHeist customer, you’re not only receiving a free upgrade to the upcoming, highly anticipated Tweetie 2 – we’ve also arranged exclusive access to the pre-public beta for you guys!

Have fun using the best Mac Twitter client for now… and stay tuned for an email from us in about a month with your invite to the future of Mac tweeting.

When I wrote that location would be this year’s Twitter at SXSW, I also meant that Twitter’s geolocation would be this year’s Twitter at SXSW. The service has just turned on geolocation on its website today for the first time.

While Twitter’s geolocation feature has been live through its API since last November, there was no sign of integration into the main twitter.com site until now. As you can see in the screenshot above, for tweets tagged with location, right next to the source of the tweet there is a location placemarker. When you hover over it, it turns blue, and clicking on it brings up a little Google map showing the location that tweet was sent from.

You can see these maps as overlays both on individual tweet pages, and on tweets in your main stream. In some cases, depending on how Twitter geolocation API is being used, it looks like place names are even passed through to Twitter. For example, here’s a tweet sent from Foursquare that also says where the tweet is being sent from.

The timing of this move by Twitter is significant. Earlier today, the New York Times reported that Facebook would unveil its answer to location next month at its f8 conference. Twitter’s first-ever Chirp conference takes place just one week before f8. Google, meanwhile, is in the game with Latitude and to some extent Buzz (but could have been in it a lot more). And of course, every app and their mother appears to be launching with some sort of location functionality at the SXSW in Austin, Texas, which begins on Friday. Many of those apps use Twitter’s geolocation API to pass the data back to Twitter, so it makes sense that this would be a good time to turn the functionality on for the website.

Update: It looks like Twitter has just turned off the location functionality after having it on for a bit. Look for it to come back shortly — certainly some time before SXSW.

[thanks Chad]