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Over 40% of a brand's Facebook page fans "unlike" the page as soon as a campaign ends, suggesting that a lot of follower activity on the social network is driven by agency interaction, not a real loyalty to the brand, according to a new study.

The study by DDB reveals that two in five brand followers surveyed are not interested in engaging with Facebook pages after a marketing engagement ends.

Yossy Mendolovich CEO of IMGuest, the world's only hotel management social network, has launched a service that flips the script on how marketing people interact with guests at prominent chains.

IMGuest is a premium marketing tool launched three days ago that enables marketing and guest relations staff to use the social graph to interact with hotel guests at check-in. From that moment on, staff can push out discounts and other offers to them instantaneously based on their interests.

For the first time ever, 50% of all American adults are using social networking sites, according to new data from the Pew Internet and American Life Project.

Of active Internet users in particular, 65% are social networking users, a number that continues to climb. To put things in perspective, only 29% of adult American Internet users reported using social networking tools in 2008.

On August 15, Twitter turned on its t.co link wrapper for all links longer than 19 characters. The t.co URL shortener was first announced in June of last year, and it was implemented on Twitter.com this June. Eventually, Twitter plans to wrap all links, regardless of length. Prior to that, it will increase the link length to 20 characters to accommodate the 's' that will be added as Twitter moves to secure HTTPS service by default.

From the user's perspective, t.co links appear as the first 19 characters of the real URL, without the HTTP or HTTPS visible, and they trail off into ellipses. When everything's working properly - unlike several periods of time today - users won't see an obscured t.co shortlink but rather the actual linked domain. One problem this aims to solve is the concealing of malicious links behind external URL shorteners. Twitter checks all shortened links against their list of malicious sites. But t.co also solves another less visible problem: it reveals Twitter's true influence as a referring traffic source.

SocialNuggets is another sentiment analysis vendor, but they are trying to differentiate themselves by analyzing over a million social media conversations that they scan as part of their service. They have set their initial sites at the consumer electronics industry and have graphed some interesting changes to the market dynamics there. Here are a few graphs showing what they have learned, you can find more here.

According to StatCounter's measurements, StumbleUpon has just surpassed Facebook and now delivers more than half of all social media referral traffic in the U.S. StumbleUpon founder and CEO Garrett Camp tweeted the news this afternoon.

Facebook achieved this goal in April of 2010, but StumbleUpon was already well on its way. At that time, StumbleUpon already gave twice as many referrals as Twitter. StumbleUpon's user experience is fanciful and fun, but its traffic power for publishers is quite serious. While the other social networks make the headlines, StumbleUpon has been a quiet success story. In light of today's news, it won't be so quiet for long.

There are lots of suggestions on improving your social media campaigns out on the Interwebs, but this post from Jesse Stanchak caught my attention. He describes how to plan a campaign like an art thief.. Now Stanchak isn't advocating actual larceny here, but his suggestions are good ones and worth repeating.

He says, "a lot of the potential of social media is tied up in being willing to think big and then plan small, just like an art thief."

A study last month by the Info-Tech Research Group found little difference by organization size in how businesses use social media, and also provided lots of practical information on how enterprises should make use of social media management tools. The report looked at the tools from a variety of vendors, including Radian6, Sprout Social, Syncapse, Socialware, Cymfony, Visible Technologies and Lithium.

Do you remember the days when Geocities and bulletin board systems walked the earth? It might be a stretch to say that these early communities were social media. Certainly, they laid the groundwork for what we use today and played a key role in how electronic communities came together. To jog your memory and provide some entertainment value, an interesting chart in a newsletter by law firm Morrison & Foerster here is worth a glance. Yes, a law firm.

This week we've asked a few big questions, and shared many of the responses with you. As Fridays are for reminiscing, we've culled our favorite reader responses that didn't make it into those big questions to share with you in our Community Wrap Up.

These responses are from Google Plus, Twitter, Facebook and our own on-site comments, and we've used Storify to present them in a clear and easy to follow manner. If you have additional responses, please leave them in the comments.