With the launch of Instagram video and the overruling of Prop 8 today, social media has been abuzz with tons of fun videos and photos. We're rounding up the best in fashion social media so far this week, including Mulberry's new ad campaign fronted by Cara Delevingne, a rainbow cake to support gay marriage, and Chrissy Teigen's faux sex tape!
On Allison: Beckley dress, Elizabeth and James necklace.