Major Internet companies like Facebook are responding with message services that are focused on immediate gratification.

The problem with e-mail, young people say, is that it involves a boringly long process of signing into an account, typing out a subject line and then sending a message that might not be received or answered for hours. And sign-offs like “sincerely” — seriously?

Lena Jenny, 17, a high school senior in Cupertino, Calif., said texting was so quick that “I sometimes have an answer before I even shut my phone.” E-mail, she added, is “so lame.”…

Facebook also killed the “cc” and “bcc” lines. And hitting the enter key can immediately fire off the message, à la instant messaging, instead of creating a new paragraph. The changes, company executives say, leave behind time-consuming formalities that separate users from what they crave: instant conversation.