Nothing says love on Valentine’s Day in San Francisco more than meeting up for the free pillow fight at the Embarcadero. As the clock tower struck 6 p.m., the pillow warriors — and a solitary Spiderman — raised their pillows and let out a battle cry. Among the chaos, a tall, bearded man holding a large plush red heart with arms jogged gently through the crowd, touching one of the soft red hands on people’s heads and yelling, “Boop!”