Justin Halpern, 29, still lives at home — and he’s just turned his four-month-old Twitter site into a TV series for CBS.

Who says the Internet is a dark, lonley place?

Halpern’s story may soon be the stuff of slacker legend and give Hollywood a whole new path to show-biz success.

Last August, the screenwriter-wannabe was forced to move back with his parents in San Diego after breaking up with his girlfriend.

While living there — saving money while working remotely as a maxim.com editor — he started a Twitter page to chronicle the outrageously funny things that his 73-year-old, retired father said.