Some acquisitions turn out to be successful, and for others, there’s always the “undo” button (or in this case, the “unpin” button). Instapaper announced Monday that control over its application was being transferred from Pinterest to a new company owned and operated by the Instapaper team, Instant Paper, following a 21-day waiting period. Pinterest acquired… https://www.adweek.com/digital/instapaper-unpins-itself-from-pinterest-becomes-separate-company-again/