Hiring managers like Johnson say an increasing number of job hunters are just too casual when it comes to communicating about career opportunities in cyberspace and on mobile devices. Thank-yous on paper aren't necessary, but some applicants are writing e-mails that contain shorthand language and decorative symbols, while others are sending hasty and poorly thought-out messages to and from mobile devices. Job hunters are also using social-networking sites like Facebook and MySpace to try to befriend less-than-willing interviewers.