ComScore has released its list of the top fifty most-visited websites in the U.S. for September, and, for the first time, Pinterest has made an appearance, albeit barely.

Pinterest’s 25.3 million visitors in September was good enough for 50th place on the list, behind its more senior social media brethren MySpace (47th), Instagram (44th), Twitter (27th), LinkedIn (26th) and Facebook (4th).

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