How to spot a ‘performative’ friend, from Taylor Swift to The Rock

From unnecessary Instagram hashtags to unflattering ‘happy birthday’ selfies - the telltale signs that it’s all about themIt was Selena Gomez’s 26th birthday on Sunday and Taylor Swift baked her a cake to celebrate, sharing a photo of it on Instagram. Baking someone a cake is a sweet gesture but – unless Swift is sending it to her –Gomez will never eat her birthday cake, because they are thousands of miles apart. So, in effect, Swift just wrote someone else&rs