Oprah Winfrey-backed WeightWatchers facesmajor backlash online over an influencer campaign to promote the brand’s latest program based around weight loss injection drugs, RadarOnline.com has learned. Social media influencers claim WeightWatchers offered to pay them to promote the GLP-1 Program to followers despite never having tried the product. WeightWatchers kicked off their new program with the GLP-1 hype house and invited influencers to a glitzy Los Angeles mansion to back protein snacks, take selfies with oversized injector pen props, and gush about how Ozempic changed their lives. The ca…