It's official, Sharon Tate, the 60s doe-eyed actress and Valley Of The Dolls star, is so having a social media moment. This week, Pinterest and Twitter have 'slipped into a 1968 time warp', according to The New York Times, but why? Well, some Mad Men critics reckon that by the end of this season, Megan Draper will meet the same tragic fate as the vintage pin-up. Meanwhile, Tate’s surviving sis Debra has just published a book dedicated to the Hollywood legend’s too-short life, adding to her heartbreaking but still mystical legacy. Here's what you need to know about ST, with a few snaps of the retro queen to enjoy/pin…