Two social media influencers who managed to make the Hollywood sign read “Hollyboob” before being arrested on suspicion of trespassing Monday said they did so to challenge censorship on Instagram. One of them, they said, lost millions of followers — and part of her livelihood — when her accounts were shuttered for nudity. That their stunt also raised awareness for breast cancer and brought smiles to faces around the world, they said, were bonuses. “It’s awesome,” said Julia Rose, 27, of L.A., whose Shagmag company brands itself as a modern rival to Playboy. “All of it combined together has been really, really great.”