Sean Marotta put on Twitter an open offer to have coffee, thinking that one or two young lawyers in Washington, D.C., might have interest in meeting him, a seventh-year associate in Hogan Lovells' appellate practice.

But then the requests multiplied. Marotta, whose Twitter presence is among those central to the #AppellateTwitter online community, ultimately met with 15 summer associates this year from a variety of law programs in the nation's capital. He would greet them in Hogan Lovells' concourse, walk them over to a nearby Starbucks and then talk for an hour.

After two separate summer legal interns with the U.S. Securities and Exchange Commission requested coffees, he upgraded their chat to Shake Shack. After each meeting, the summers posed for selfies with Marotta to prove to their tweeps the power of online connections.