Rihanna and Chris Brown appear to have engaged in an exchange on Twitter after their recent split.

Don't Wake Me Up singer, Brown, insinuated that the 25-year-old Barbados star had been unfaithful to him, writing on Twitter: '''She's not mine if she's everybody elses.''

The following day (Wednesday May 8), Rihanna seemed to respond to his social networking comments, adding ''settling [wasn't] an option'',

The Diamond singer later added: ''Settling is not an option! Nothing less than 100% loyalty, honesty, and respect!! Love ain't for kidz #butimsleeptho (sic)''