The Facebook social network developed at Harvard ________.
A.was a collaborative project with other students
B.became Mark's full-time job after completing university
C.could only be accessed by Harvard students
D.became really successful after June 2004
A.was a collaborative project with other students
B.became Mark's full-time job after completing university
C.could only be accessed by Harvard students
D.became really successful after June 2004
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