It’s no secret that social networks have had a difficult time integrating advertising that has a bang for its buck. IDC has released some data showing what social networks – and advertisers – are faced with.

Only 57% of social network users have clicked on an ad in the last year versus 79% of all users in the rest of the web.

When it comes to purchasing, only 11% of social network users will actually make one compared to 23% of the rest of the internet.

“The thinking has been that the popularity of SNS will attract a big audience and generate a lot of traffic, which in turn will produce enormous amounts of user-generated content (UGC) and therefore advertising inventory – without any expenses for editorial staff or content distribution deals,” said Karsten Weide, program director, Digital Marketplace: Media and Advertising. “All of the above has proven true – except that almost invariably, SNS have had a hard time selling this inventory.”

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Does your site maintain its usability across many browsers? If not, you could end up leaving money on the table this holiday season. Browsers such as Firefox, Chrome, and Safari (which comes standard on Macs) now make up about 30% of the browser market. Firefox alone enjoys 20% of the overall market share.

Matt Poepsel, vice president of Gomez, Inc., whose services test and monitor the performance of websites says that the increase of non-Internet Explorer browsers could cause some e-tailers grief.

“This year more than ever, websites can look and function differently from one browser to another. Online retailers can no longer assume that all shoppers are using Internet Explorer. They must ensure their sites look good and work well across a wide range of browsers – or risk frustrating customers and losing the sale.”

It’s the day before Thanksgiving, where you show up at the office, but you’re really thinking about tomorrow’s good meal. You’ve worked hard to set up those search marketing campaigns to run strong on Black Friday and Cyber Monday.

So, I really hate to bring you the bad news, but keeping it from you would be a disservice.

Let’s just rip off the bandaid.

First up, eMarketer has lowered its projections for online advertising spending for 2009. The new growth number is 8.9%, down from 14.5% projected in August. They’re also expecting a long recovery, projecting 2010 growth to be just 10.9%. In five years, things will still be slower on the uptake (than in recent years). Projections for 2013 growth are at 13.5%. Silver lining: some of the tapering off is likely due to market saturation and not just the economy.

Next, eBay’s traffic is declining. In January of 2007, eBay saw 62 million unique visitors. Last month, they saw just 49 million. Sure, not all of that was due to the economy, but dipping below 50 million can’t be good for eBay.

I saved the worst for last. comScore has released data showing that online consumer spending for the first 23 days of November was down 4% from last year. That’s not a slow down in growth people, that’s flat out shrinkage.

But I’m not a total Scrooge. Unemployment numbers were better than expected this week. And at least one Slate columnist explains why fears of another Great Depression could be overblown (let’s hope he’s right!).

As we overdose on turkey, stuffing and pumpkin pie, let us not forget the ultimate strategy for marketing, business and life in general: Hope for the best but prepare for the worst.

Related Reading:
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E-commerce Growth Slows to Just 1% in October 2008
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The year-over-year gains for Google that we saw in Nielsen Online’s October 2008 search engine rankings were mirrored in comScore’s rankings for the same month.

Google enjoyed a nice 63.1% share, up from 58.5% during the same time last year. Yahoo was at 20.5% down from 22.9%> Microsoft was at 8.5%, down from 9.7%.

There was one major difference between Nielsen and comScore. Nielsen said the number of searches declined, while comparing comScore’s October 2008 data to its 2007 data shows that the number of searches increased to 12.6 million billion up from 10.5 million billion.

Check out the rest of the data here: