So who's on LinkedIn? The NYT sums up users in this way:
The average age of a LinkedIn user is 41, the point in life where people are less likely to build their digital identities around dates, parties and photos of revelry.
LinkedIn gives professionals, even the most hopeless wallflower, a painless way to follow the advice of every career counselor: build a network. Users maintain online résumés, establish links with colleagues and business acquaintances and then expand their networks to the contacts of their contacts. The service also helps them search for experts who can help them solve daily business problems.
The four-year-old site is decidedly antisocial: only last fall, after what executives describe as a year of intense debate, did the company ask members to add photos to their profiles.
That business-only-please strategy appears to be paying off. The number of people using LinkedIn, based in Mountain View, Calif., tripled in May over the previous year, according to Nielsen Online. At 23 million members, LinkedIn remains far smaller than Facebook and MySpace, each with 115 million members, but it is growing considerably faster.
Here's a link to my LinkedIn profile.