Nathaneo Johnson and Sean Hargrow cofounded Series.SeriesSeries, a networking app focused on Gen Z, lives fully in iMessage.Founded by Yale students Nathaneo Johnson and Sean Hargrow, the startup raised $5.1 million.Read the pitch deck Series is sharing with investors as it raises its new funding round.Once a day, I get a text message with 10 photos of random people looking for jobs, professional connections, or, on occasion, a new friend or dat…