Job-seekers can now get CareerBuilder job alerts via Twitter — the first of the U.S.’s Big Three job sites to offer the feature. Seekers can go to TwitterJobAlerts.com and sign themselves up in a simple, two-step process.

You start by typing in your Twitter account name on TwitterJobAlerts.com and clicking a link that takes you to CareerBuilder’s profile on Twitter: http://twitter.com/job_alerts. You got back to TwitterJobAlerts.com and start setting up as many alerts as you wish, by keyword and location. The alerts are delivered to your Twitter account.

When you receive an alert, a link takes you back to the CareerBuilder listing.

You can set up alerts to ping you once a day or once a week.

It’s a nice start. Some functions we’d like to see, though:

– Alerts in real-time, as the jobs are posted. (The early bird gets the worm, after all.)

– The ability to trigger a job application with your direct reply from Twitter. (Twitter’s all about immediacy, after all.)

“We’re still working out the kinks,” CareerBuilder spokesperson Allison Nawoj told ERE.net, and added that user feedback warrants, “we may offer real-time” alerts.

It’d make sense for CareerBuilder to wait to see before it puts any more development time into the feature. For one thing, Twitter is considering charging companies for their commercial use.

Right now, CareerBuilder’s effort only supports U.S. use, but we note that it’s set up accounts on Twitter for its international properties.

Seekers are already finding jobs from CareerBuilder, HotJobs and Monster on Twitter, either forwarded by job aggregators or by recruiters themselves.