facebook single
A facebook single is someone who's in a relationship but still says they're single on Facebook so they can flirt with other people. It's like cheating, but with fewer consequences.
He said, 'I'm single!' even though he was out with his girlfriend every night.
She posted, 'Still single!' while her boyfriend was messaging her all day.
He told me, 'I'm still single!' even though he was seen holding hands with her at the mall.