Today, the professional networking siteLinkedIndebuted on the New York Stock Exchange, trading at $83, up 84% from its initial public offering price of $45. LinkedIn’s offering of 7.84 million shares, led by Morgan Stanley, Bank of America-Merrill Lynch and J.P. Morgan Chase & Co., makes it the biggest U.S. Internet IPO since Google. At one point this morning, the stock (LNKD) was trading at $84.80 a share, valuing the company at nearly $8 billion, which is 520 times its 2010 net income according toThe Wall Street Journal....

LinkedIn has updated its user profiles today with a brand new look and some new features. Among the changes are a redesigned profile, a checklist to help you set up your profile and PDF downloading of profiles. The new look seems to be live for everyone now so you should be able to see it on your own profile. One of the additions is an updated checklist tool that gives you reminders about the various features of LinkedIn and the steps that you need to take to fill out your profile....

LinkedIn could be aiming to go public this year, if a report fromReutersis to be believed today. According to the report, LinkedIn has selected its financial underwriters for the process, although Reuters’ sources haven’t commented on the value of the Initial Public Offering. If true, the professional social network could beat other speculated tech IPOs like Facebook and Zynga to the punch. However, LinkedIn declined to give any detailed comment on the rumour, telling Reuters “An IPO is just one of many tactics that we could consider”....

LinkedInis reportedly set to file papers to go public as soon as today, Kara Swisher over atAll Things Digitalreports. Swisher’s sources say that papers could be submitted once markets close today. LinkedIn isn’t commenting on the speculation, although it follows arecent reportthat the company was gearing up for an initial public offering and had selected financial underwriters for the process. Swisher suggests that this could be Morgan Stanley or Goldman Sachs....

Just weeks after LinkedInfiledto go public, it appears that rival social network for professionalsViadeois thinking of heading in the same direction. AFPreports(in French) that the company is “Studying the possibility” of an Initial Public Offering. Although the company doesn’t appear to be rushing into a decision, Dan Serfaty, co-founder of Viadeo, is quoted as saying “We’ve existed for five years, we have the size, we are credible. In terms of images and resources, it could be interesting,”...