By Tom de Castella     BBC News Magazine                        
January  is a cornucopia of technological tipping and frantic futurology, but do  you ever get a nagging fear that trends are passing you by?
What is 
Pinterest? And is it important what it is?
And will 
Summly have a big year in 2012? And does that matter?
There are plenty of people who would answer these questions with a stock "I don't care". 
These people might refuse to even look at social media, and  choose to eschew the smartphone and the tablet. But there are plenty of  jobs where you might have to take notice.
There are areas of advertising, marketing, public relations,  journalism, academia, design, and finance where workers might find  themselves looking a bit silly if they reveal they have no idea of the  technological lie of the land. 
And the narrowly defined technology sector itself is ever-more important. 
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Some are terrified as they don't know where it will end”
John McGurk  Chartered Institute for Personnel and Development     But imagine the job of a  policeman. A detective in 2005 would, more than likely, not have heard  of Facebook. A detective in 2012 would know that a murder victim's  social media activity would have to be investigated as a matter of  course. 
If you're a school headteacher and you don't understand the implications of the rise of location-based websites and apps like 
Foursquare, you might one day regret it. 
Malcolm Gladwell wrote more than a decade ago about the  "tipping point", the moment when a particular phenomenon suddenly became  "big". 
There is a point when, arguably, you should know about  something. There's a point when not knowing is a bit like a judge asking  who Bruce Springsteen is. And the earlier you know, the better.
  Continue reading the main story  Say what?
-  Pinterest: image-based website where users create virtual pinboards based on specific interests, such as baking
-  Summly: iPhone app which summarises and simplifies the content of web pages and search results
-  Flipboard: designed for use on iPads, allows users to pick websites they want to create a personalised magazine
-  Foursquare: location-based social network
-  Zeebox: app that links user's TV viewing and social networking
 The nagging anxiety at the back of the mind that you are missing out might be called "trendfear".
In an interview about the internet with the Sunday Times in  1999, Douglas Adams memorably satirised a common attitude towards new  technology and trends. 
Everything that's already in the world when you're born is  just normal, suggested Adams. Anything created between birth and the age  of 30 is incredibly exciting and creative and with any luck you can  make a career out of it.
But whatever is invented after you've turned 30 is against  the natural order of things and the beginning of the end of civilisation  as we know it -until it's been around for about 10 years, when it  gradually turns out to be all right really.
Just the language of the predictions can leave many people stumped. 
    One day's bit of hype is the next day's phenomenon
      One day's bit of hype is the next day's phenomenon    Food writer Marina O'Loughlin recently predicted: "Even more  exciting is the rock'n'roll-isation of eating: follow food swarm artists  such as London's @Tweat_up (tagline: 'So far no deaths or arrests')." 
You might also have found yourself baffled by the rise of  "dual screening" - watching television and posting instant reactions on  Twitter.
At the other end of the technological spectrum is playwright  Tom Stoppard, who recently revealed he had no computer or "twitter  machine".
Much is made by the government about those people, often  elderly or poor, who miss out on things because they have no internet  access.
People who aren't successful playwrights will struggle to get  a job without at least knowing how to use email, Google, Word, Excel or  Powerpoint, says Dr John McGurk, learning adviser at the Chartered  Institute for Personnel and Development. 
And there are plenty of jobs where more than this is required.
Universities are bringing in social networked learning, and  some academics are struggling to cope, McGurk believes. "They're being  encouraged to engage with students on social media. But some are  terrified as they don't know where it will end."
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There's no cure for it. The sense of nagging anxiety about trends will always be there”
James Gleick  Author, The Information: a History, a Theory, a Flood     Of course, those feeling anxious  that they are missing new trends that could affect them professionally  are also aware that trends can fail to live up to the hype. 
If you only keep up with new gizmos and gadgets out of duty,  you don't want to waste your time on the technological dead ends and the  cultural cul-de-sacs.
With hindsight, did anybody really need to follow the rise of flashmobbing? 
And there is just so much to follow. The explosion of  websites, apps and social networking, all apparently feeding off each  other in "real time", has made keeping up harder than ever.
It's unnerving because we are no longer all equal in the  information stakes, says digital strategist Nic Newman. "In the era of  mass media everyone found everything out at the same time. 
"The difference now is that with all these different  information channels some people know things almost as soon as they  happen. But people outside those networks are not hearing it." 
As one Twitter user puts it, "you feel almost behind when you  read a story in the news rather than watching it unfold through digital  media".
Once upon a time, a major innovation would be recorded in the Times. Now the word could come from anywhere.
In the 17th Century, the philosopher Gottfried Leibniz felt  there were already too many books to keep track of. But today the scale  of the overload is of a different magnitude.
    Summly, invented by a British teenager, could be the next big thing, or not
      Summly, invented by a British teenager, could be the next big thing, or not    The coming together of GPS and mobile phones has allowed a raft of location-based apps to take hold.
Discount websites like Groupon can now target people shopping  in a certain shopping centre with specific offers. And the Waze app  interrogates drivers' sat-navs to share traffic information and cut  delays.
Many new websites and apps are there to tackle the fear of information overload. 
Zite  an app for the iPhone, identifies what information a user is interested  in, and teaches the device to download relevant articles. 
What increases the elusiveness of the trends is that a lot of  new sites have "stealth launches". Google+ took things a stage further  by sending out invitations only to those its algorithms had calculated  were people of influence. This created a sense of "social cachet for  those invited, and a feeling of anxiety for those left out," Newman  says.
"Sharing" rises and rises. Pinterest, already in the top 10  social networks in the US, is an online noticeboard (pinboard) featuring  photographs of enticing desserts, hairstyles and random signs and  sayings, among other curiosities. 
Flipboard  creates a magazine out of someone's social networking content, while  Zeebox allows people to combine watching television and commenting on it  with their online friends. 
 "Frictionless sharing takes things further still, letting  friends on Facebook see everything you're reading on newspaper websites  for example," Newman.
Evening Standard columnist Sam Leith, describes social networks as a "fantastic nourisher of trend envy". 
O'Loughlin agrees. "I had a moment of crippling anxiety when  Google+ arrived and all the people I'd carefully curated on Twitter  buggered off. It's that moment - 'Oh my God, I'm not relevant any  more'."
Dr Bernie Hogan, research fellow at the Oxford Internet  Institute, says social media can reinforce the sense that one is missing  out on the latest trends. "People are very selective of what they put  online. But it's easy to forget about this selectivity and just think  there's always a party somewhere and you're missing out on it."
It's hard to escape it all, says James Gleick, author of The  Information: a History, a Theory, a Flood.  Mankind is not passing  through the information age, it's here to stay. "There's no cure for it.  The sense of nagging anxiety about trends will always be there." 
But if all else fails, why not switch off all your devices and open that book from 1850 you've always been meaning to start.