Many web addresses are very long and contain strange characters, e.g. ?, &, =, ", ', % e.t.c. It is difficult to remember URLs with this symbols and characters.
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long URLs in phone
If you wish display the web page in mobile phone and the address contains more than twenty characters, It takes a long time to type this web address.
mails, facebook
Sharing long links looks less credible and people could worry about this links, because it may look like spam.
