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** Yammer is a “FREE” Microblogging service. 
Like Twitter, it allows users to post updates of their activities, follow others’ updates and tag content.
However, companies can claim their networks to get administrative rights and security features for one dollar per user per month
Unlike Twitter, Yammer focuses on businesses, and only individuals with the same email domain can join a given network.
** Twitter is a free social networking and micro-blogging service that enables its users to send and read other users’ updates known as tweets. Tweets are text-based posts of up to 140 characters, displayed on the user’s profile page and delivered to other users who have subscribed to them (known as followers).
Senders can restrict delivery to those in their circle of friends or, by default, allow anybody to access them. Users can send and receive tweets via the Twitter website.
** Facebook is a leading social networking site with over 500 million active members.
- More than 500 million active users
- 50% of our active users log on to Facebook in any given day
- Average user has 130 friends
- People spend over 700 billion minutes per month on Facebook
- There are over 900 million objects that people interact with (pages, groups, events and community pages)
- Average user is connected to 80 community pages, groups and events
- Average user creates 90 pieces of content each month
- More than 30 billion pieces of content (web links, news stories, blog posts, notes, photo albums, etc.) shared each month.
Simply Powerful . . . . . . Cover To Cover also has a Facebook Business Fan Page.
n . . . . Your professional network of trusted contacts gives you an advantage in your career, and is one of your most valuable assets.
LinkedIn exists to help you make better use of your professional network and help the people you trust in return.
- LinkedIn has over 75 million members in over 200 countries.
- A new member joins LinkedIn approximately every second, and about half of our members are outside the U.S.
- Executives from all Fortune 500 companies are LinkedIn members.
Four Square . . . . For Your Business !!!
Foursquare aims 
to encourage people to explore their neighborhoods and then reward people for doing so.
As a business owner, you can use foursquare to engage your increasingly mobile customers with foursquare “Specials,” which are discounts and prizes you can offer your loyal customers when they check in on foursquare at your venue.
Don’t forget to show extra love to your venue’s Mayor! Additionally, if you offer foursquare Specials to your customers, you will be able to track how your venue is performing over time thanks to our robust set of venue analytics — for free!
Virtual Worlds – “Second Life” is a free 3D virtual world imagined and created by its Residents. To get started, you will need to download the Second Life viewer. Once installed, you will be able to walk, “teleport” or even fly to thousands of exciting 3D locations. You can also use voice and text chat to communicate with other real people from around the world. 
With a Resident population of millions of real people from around the world each person is represented by an avatar that represents their chosen digital persona.
They are gamers, housewives, artists, musicians, programmers, lawyers, firemen, political activists, college students, business owners, active duty military, architects, and medical doctors, to name just a few. There are even a fair number who are professional creators in Second Life. If you have a headset, you can even talk and use text chat for free.
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