Rachel Riley was among the thousands who took part in the 48-hour Twitter "walkout" in response to a series of anti-Semitic tweets shared by rapper Wiley. And on Wednesday, the Countdown presenter thanked those for taking part in the boycott, which was led by former EastEnders star Tracy-Ann Oberman.MORE: Rachel Riley and Pasha Kovalev's daughter reaches new milestone"You're all AMAZING.