Perera, L.C.P.; Ekanayaka, E.M.P.M.B.
(Faculty of Graduate Studies, University of Kelaniya, Sri Lanka, 2016)
At present 40% of the world population use internet daily. The percentage keeps on increasing
day by day. According to the Alexa ranking, Google.com, youtube.com, facebook.com,
Baidu.com, Yahoo.com, and Wikipedia.org are ...