From a WSJ piece on threats the easy accessibility of old flames pose online:

Some couples share their passwords. “If your bank accounts are common, why not your Twitter and Facebook accounts?” asks Clemson Smith Muñiz, a Spanish-language sports announcer in New York.
Sound scary? Mr. Smith Muñiz discovered one of the drawbacks when he checked his Twitter following—which he spent months trying to build—and discovered an alarming trend: It kept shrinking.
At first, he worried that people found him boring and were dropping out. He tried harder to be clever, “tweeting” about Cuban baseball players and his dental problems. He even pleaded for readers: “Follow me and I’ll follow you.”
Then he discovered his problem: his wife.
“She told me she was going on my account and taking off women she thought were coming on to me,” says Mr. Smith Muñiz, 51. She didn’t care if they were old girlfriends or porn stars. “She said she doesn’t want temptation to be there,” he says. (His wife declined to be interviewed.)