Like e-mail and text messages, comments posted on a social networking service may be cited in running text ("In a message posted to her Twitter account on August 25, 2011, . . .") instead of in parentheses, and they are rarely listed in a reference list. The following example shows a more formal parenthetical citation.
1050 Massachusetts Ave., Cambridge, MA 02138
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Tel: +254 20 6993000
Fax: +254 20 609518