Chris Brown is back on Twitter. The rapper quit the social networking site last week, following a nasty argument on there with comedienne Jenny Johnson . His page has reappeared, but so far he hasn't posted anything.

Chris got upset last week after Johnson responded to a tweet he posted that read, "I look old as f**k! I'm only 23..." She replied, "I know! Being a worthless piece of s**t can really age a person."

While all is quiet on his Twitter feed, Chris has been busy on Instagram , posting a photo of himself and Rihanna on Sunday with the words, “What would music today sound like if these kids didn’t exist?”

Rihanna has also taken to her Instagram pages to post a photo of a shirtless Chris and one of herself draped around him.

Copyright 2012 ABC News Radio