Even after the past week he is less connected online than many of his sports star competitors.
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Was Zuck caught up by this or did he decide he wanted to lead by example and be less private online?
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This trend is hitting retailers hard as the most popular products are easily obtained direct from manufacturers, service providers or less expensive online outlets.
We're less inhibited online because we don't have to see the reaction of the person we're addressing, says Sherry Turkle, psychologist and Massachusetts Institute of Technology professor of the social studies of science and technology.
According to survey of more than 15, 000 small- and medium-sized enterprises, those with a medium or heavy Internet presence expect to grow by 17% over the next three years, compared with 12% for those less engaged online.
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Nevertheless, while the Net may not be the best place to buy toothpaste or dried squid, some clued-in cybernauts find it ideal for locating products that might not be available locally - or are less expensive online.
Not only are Heavy Social Media users less likely to purchase online, they spend a lot less money when they do.
This exists, more or less, in online bill payment systems that can run on BlackBerries.
If you can actually find a store associate, shoppers trust the information less than anonymous online sources.
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Outside the English-speaking world newspapers often face less competition from online news aggregators and other Silicon Valley wheezes.
The quality of outcomes is less for an online student than for one who has received the same instruction in a classroom.
For people less familiar with online shopping, the package includes a multimedia tutorial from U.S. Robotics with information on how to buy online and on various security issues.
Not only are those who take a greater number of online courses less likely to ever earn degrees, new research from Columbia shows that the rise of online education actually widens the achievement gap between demographic groups, with those who struggle in a traditional college setting having an even more difficult time navigating the waters of MOOCs and distance ed.
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Also, Journal Register's classified ads are less likely to migrate online than big-city classifieds.
Showrooming is when shoppers visit physical stores to check out a product, then buy it elsewhere online for less.
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Why are females, who make up a larger part of the workforce than men, engaging less in professional networking online?
Like Ally, American Express Bank operates more or less exclusively as an online bank, with just a single physical location.
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The key is that future user growth will depend on how well Facebook does in emerging markets, where computer proliferation is much lower and online advertising less lucrative.
Now that everything is online perhaps less so.
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As more schools embraced online education, smaller, less well-known colleges and for-profit universities drove further innovation in the online education space.
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Only the oldest Americans spend less than Gen X (and slightly less than Gen Y) online.
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Yet today less than a third of online marketers are making money, according to Activmedia, a New Hampshire consultancy.
It has lots of implications, mainly in retail and stockists: online stores are less picky, but traditional retail is very picky.
Finding comparable businesses that sell in cyberspace offers fewer historical examples than farms or dental practices, but a positive feature is that the value of an online business is less likely to be geographically affected.
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Shut-downs are now far less frequent, so that a typical station in America is now online 90% of the time, up from less than 50% in the 1970s.
Arguably, the enterprise value is less than what the non-online segment, Time Warner, is worth on its own.
Paying bills online is "just less stressful and less hassle", she argues.
As more shopping moves online we simply need less physical retail space.
The report's suggestion that online material had far less reach and credibility than traditional media was seen as out of touch by some critics.
For example, Dell, a computer company, established its leadership of the PC market by allowing customers more or less to assemble their own PCs online.
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