VentureBeat

(UPDATED: IAC put out a release this morning — see below.)

The HealthCentral Network, an Arlington, Va., collection of health-information sites, raised roughly $50 million, paidContent reports. Investors included some big names, include Barry Diller’s online media and commerce conglomerate IAC, Sequoia Capital, Carlyle Group and Polaris Venture Partners.

HealthCentral runs about 30 health-related Web sites, ranging from general-info offerings like HealthCentral.com to disease-specific sites such as OurAlzheimers.com and MultipleSclerosisCentral.com. (The company also owns the DrKoop.com name, although that site is no longer affiliated with the former Surgeon General.) The sites are all essentially clones of one another in style and appearance, and generally offer a grab-bag of general or disease-specific information and some seemingly sparsely attended forums.

HealthCentral doesn’t seem to produce much of its own content, either; it lists five different sources, including Harvard Health Publications, HealthDay, and Thomson, at the bottom of its sites. In other words, it’s difficult to see exactly what makes the business worth the sums investors are pouring into it, as you can easily find much the same stuff on a half-dozen other sites.

In short, the whole HealthCentral Network looks a lot like a crass money-grab — a minimal deployment of resources designed to catch, if not retain, the maximum number of eyeballs. Which means that this latest investment is simply the latest in a flood of hot money that’s been pouring into health and so-called Health 2.0 sites over the past year or so, a trend that’s looking more and more like an unsustainable bubble with every transaction.

We’ve covered several related launches such as Microsoft’s HealthVault, Kosmix RightHealth, HealthCare.com, Healthline, and a roundup of other startups here. Valleywag has more on HealthCentral in particular.

UPDATE: IAC issued a release on its investment this morning, which doesn’t move the ball forward in any meaningful way. But at least the deal is confirmed.

Online advertising remains hot. But with Google, Microsoft and Yahoo fighting to serve advertising to large companies and publishers, smaller business clients are left neglected.

MerchantCircle, a controversial Silicon Valley company helping thousands of small businesses market themselves online, has raised $10 million in financing to pursue these small businesses further.

It has also arranged a credit line with Square 1 Bank to acquire other rivals in the sector.

The Los Altos, Calif. company has been accused of aggressive tactics. First, it lures small businesses to sign up as customers by creating profile pages for them MerchantCircle encourages the companies to “claim” these pages, by registering at the site.

Next, if the businesses don’t sign up at MerchantCircle, the company cold-calls them. MerchantCircle does offer a real service: It helps small businesses create a more robust online presence for a fee, ranging from $29 to $99 monthly, for example tracking reviews written about them at major review sites and other business listing portals. MerchantCircle alerts them when someone leaves a review about them. Merchant circle also offers them ways to advertise online with search engines (it helps them band together to get better deals too, for example, rounding up landscaping companies and working with them to create ads more cheaply at sites like Webvisible, using economies of scale). Finally, if a small business creates an online coupon on their MerchantCircle profile page, MerchantCiircle publishes that action on the pages of other local companies (see example of this in screenshot below of a profile page). This creates peer pressure, so that other companies see the actions of their peers, and are encouraged to do the same.

The strategy has worked. It has 250,000 small business customers, after 16 months of work. The latest investment is an endorsement too: Investors include Rustic Canyon, Scale Venture Partners and Disney. IAC was a new investor, which Smith said he welcomed for its expertise at doing acquisition deals. It raised $4.2 million two years ago (see our coverage).

Ben Smith, who founded Merchant, has returned as chief executive. He had previously left to become chairman, but returned to the helm this month after the company declined an offer to be acquired. Smith decided to embark on an acquisition strategy, instead. He declined to say how much the credit line is for.

One major rival is ReachLocal, which is hiring a massive salesforce to do something similar: Sell online marketing services to small business, including ads beside Google and Yahoo search results, and tools to maximize search engine optimization tricks. That company recently raised $52 million in venture backing to continue to add to its 300 person work force, and may even try to hire as many as 10,000 — all in an effort to compete with YellowPages. Reactions to our story about ReachLocal were almost universally negative (see comments; people thought it was crazy to be hiring so aggressively). The bile may reflect a bias among our Silicon Valley readers in favor of technology. MerchantCircle is a technology company — it has almost no salesforce. It has 10 employees (the marketing calls it makes are outsourced).

Another competitor is Weblistic, which is somewhere between ReachLocal and MerchantCircle on the automation scale. It has a salesforce, but not as big as ReachLocal’s. Weblistic, a two-year-old Fremont Calif. company led by the former chief technology officer of YellowPages.com, is backed by venture capital firm Foundation Capital. It has a low profile; we haven’t mentioned them before.