Since almost all services in WEB 2.0 are for free, they might contain viruses, and can be targeted by hackers online. Also, there won’t be any type of back-up online, so if you post something for examples, and your computer crashes, then you will lose all that work you had done.
http://kianamedlej00.blogspot.ae/2013/04/web-20.html
http://kianamedlej00.blogspot.ae/2013/04/web-20.html
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