321 Megan McCarthy 08/22/07 12:00PM Filed to: Linkedin Linkedin Careers Craigslist Ipo Valleywag Valley-hot business-networking site LinkedIn uses rival Craigslist to lure applicants, describes itself in the ad as "pre-IPO." Speaking of which, has everyone seen the SEC's warning about "Pre-IPO Investing"? [Craigslist]