When you don't want to be Facebook friends

Andrea Smith recently received a Facebook friend invitation from someone she went to junior high school with — 23 years ago.

“I found it kind of baffling,” said Smith, 38, of Ypsilanti, Mich. “I knew who she was, but I don’t recall that we were ever friends. I don’t recall that we ever had a conversation.”

Social networking sites such as Facebook have experienced phenomenal growth in the past year, according to market researcher comScore. Facebook is now the No. 1 social networking site, with more than 120 million active users, and its fastest growing demographic is those 25 and older.

OK to ignore an invitation

"You don’t have to respond to every single thing that comes at you,"

“Everyone has different communication protocols,” Waldman said. “The important thing is defining what your own protocols are.”

you’re more likely to find a job lead from a friend of a friend.