<Tr> <Td> 2009 </Td> <Td> September 10 </Td> <Td> Product </Td> <Td> Facebook announces a feature whereby people can @ - tag friends in their status updates and comments . </Td> </Tr> <Tr> <Td> 2009 </Td> <Td> September </Td> <Td> Product </Td> <Td> Facebook shuts down Beacon . </Td> </Tr> <Tr> <Td> </Td> <Td> February </Td> <Td> Acquisitions by Facebook </Td> <Td> Facebook acquires Malaysian contact - importing startup Octazen Solutions . </Td> </Tr> <Tr> <Td> </Td> <Td> April 2 </Td> <Td> Acquisitions by Facebook </Td> <Td> Facebook announces the acquisition of photo - sharing service called Divvy - shot for an undisclosed amount . </Td> </Tr>

When did facebook become a billion dollar company