Speculation about the future valuations of companies like LinkedIn, Facebook and Twitter has undoubtedly driven interest in private markets where early shareholders can turn for a taste of liquidity before the big day. SharesPost, which has been a source of information on the likely IPO implications of these companies, has been among the beneficiaries: membership has doubled ... since November. According to a statement by SharesPost, "over 15,000 buyers and sellers of private equity" belong to the site.

The financial crisis, employment market and social media explosion have converged, providing a new level of clarity into what is happening in the world around us. Where was ground zero for this financial catastrophe? Well, according to the LinkedIn blog, five companies have shown the most action: Barclays (BCS), Credit Suisse (CS), Citigroup (C), Bank of America (BAC) and JPMorgan Chase (JPM). Interestingly, Goldman Sachs (GS), among the biggest winners now that we're pulling out from the recession, didn't see as much play.

The three major social media sites have been pushing new tools out to their user communities aggressively over the past year. Each company has its own set of rumors, from IPOs to being on both sides of an acquisition. While the ultimate 2010 aims of Facebook, Twitter and LinkedIn may not have been revealed to us yet, it is clear that all three are looking for ways to beef up revenue and demonstrate long-term viability.

Whether or not Facebook goes public this year, it's still pointed toward that ultimate goal. The 350-million member social network is focused on finding new sources of revenue and gaining better penetration into those it already has. Even if it's more than a year away, it's never too soon to start shoring up your financial statements for an IPO. The latest new feature from Facebook, which has been announcing enhancements fairly rapidly over the past few months, is targeted directly at advertisers, underscoring the importance that the company's attaching to revenue growth.

Look, 2009 was a "flush" year. Market rallies were constrained by the low baseline set at the end of 2008, unemployment was high and caution defined nearly every corporate decision. The travel market sucked. The art market sucked. The financial industry labored on with the support of taxpayer money while 140 banks were forced to call it quits. So, we turn to the new year, as yet undefined, for excitement of the type we want ... and it seems likely to deliver. As Nero played from the rooftops, the social media industry inched forward to the climax we hope to see this year -- the initial public offering.

The action hasn't really begun, and the signals emitted are open to various interpretations. Nonetheless, Facebook's new dual-class stock structure is hard to miss, as it would protect the influence of early entrants to the company -- either as investors or options-compensated employees in the event that the 350 million-strong social networking site brings ownership opportunities to the public.

It was only a matter of time. This week, social media platforms Twitter and LinkedIn announced new features that will undoubtedly appeal to corporate marketing departments, so Facebook hopped on the bandwagon. Its new preferred developer program is a step toward structuring the Facebook application development and services space, by endorsing providers known to the company.

The program is still in its infancy, which means there isn't much structure around it. According to AllFacebook, "[T]here's really no way to apply to be in the directory aside from being connected with the people over at Facebook." Fourteen vendors are already listed in the directory.

Look for a LinkedIn IPO, but not in the near future. Company co-founder and executive chairman Reid Hoffman has revealed his (and his investors') exit strategy, even if it could take a while to get there. Any social media company IPO would take a while to get off the ground in this market, since companies are being incredibly cautious. So, "not anytime soon" could coincide with a change in market conditions ... but Hoffman stopped well short of that.

At an event in London to celebrate LinkedIn's hitting the 3 million user mark in Britain, Hoffman said about the company's IPO prospects, "Probably at some point a balance will occur when that's the right thing. That will not occur in the near term." Worldwide, LinkedIn has 53 million members.

Twitter calls Google (GOOG) a "good role model," but says it isn't ready to rush down the road to advertising.

Nonetheless, an ad-based revenue model is something that cofounder Biz Stone says they "will be looking to do down the line." But, for now, he continues, Twitter is focused on "creating value for our users." For now, revenue generation ideas are being put on paper, "and we're definitely going to get to them," Stone says.

An unemployment rate of 10.2% means that serious jobseekers are using every tool they can find. So, it's not at all shocking that social networking tools top the list, with LinkedIn, Facebook and Twitter leading the charge. Openings are being tweeted, hints of a new position are being monitored and hot candidates are being hit up directly, even if they aren't saying they're on the prowl for a new gig. Social media is a tool to use in a job hunt but not necessarily the only one, according to Challenger, Gray & Christmas. Instead, it makes sense to balance a search with many tools.

John Challenger, CEO, says, "The job search has changed radically over the last two decades with the advent of electronic mail, the internet, social networking, smart phones, etc. However, it is important to remember that all of these technologies simply enhance the job search; they will never replace the face-to-face connections that are critical to a successful search." But, he continues that "we feel that these new networking tools are essential and now advise all of the job seekers going through our program to open LinkedIn accounts and to consider other services such as Facebook and Twitter.

Company attitudes toward social media sites vary. Some swing the doors wide open, allowing employees to tend to their Facebook farms and update Twitter statuses throughout the day. Others lock 'em down, keeping non-business site access to a minimum.

A recent study found that, in the United States, 77% of employees with Facebook accounts check in with the community from the office. And, the amount of time they're spending in this part of the online world is growing. In the United Kingdom, another study found that 57% log in regularly from work, costing their employers 40 minutes a day.

Philip Wicks, a consultant at Morse PLC, a technology research firm in London, "It isn't just something you can do for half an hour during a lunch break but all through the day and because of that, it has a huge impact because people aren't necessarily concentrating on what they should be doing during the day." He estimates that this translates to lost productivity of $2.25 billion a year.

It seems like the obvious move would be to block the sites, but William Beers of PricewaterhouseCoopers disagrees. "Instead of trying to shut it down, I think we should try to embrace these technologies, put in a nice policy that governs it and explain to users the risks related to it, provide some training and then see what business benefits we can have from it," he said.