A few weeks ago, we reported that students in Emerson professor David Gerzof Richard’s social-media class had invited Chad Ochocinco to speak to them about Twitter. The Pats receiver, who has 3 million followers on Twitter, seemed receptive, but nothing happened. Today, Ochocinco tweeted @davidgerzof: “David I haven’t forgot, if I can’t make it to #ESM [Emerson social media], I’ll substitute it with a field trip style dinner with the entire class.’’ Gerzof Richard called Ochocinco’s offer a “good option play,’’ but he’s hoping No. 85 will find the time to visit the classroom. “To have here would be a big win for us,’’ said the professor.