Dimension, the social commerce tech company building Seller OS, an agentic AI operating system that replaces TikTok Shop's native Seller Center, announced that it has raised $1.65 million in seed funding. The round includes participation from Science Inc., UpscaleX, OpenSky, Long Run Capital, 1864 Fund, Lawrence Hsu and creator-investor Austin Sprinz. The funding accelerates Seller OS's move from private beta to general availability for the agencies and brands that run social commerce.