Question

how is twitter differ from facebook

Answer 1

Both networks are capable of allowing some customization to include your branding. Facebook allows likes and friends while Twitter's call to action is to follow. Inside of Facebook you will Like or Share something. Yet inside of Twitter you will ReTweet or Favorite Something

Answer 2

Facebook networks People while Twitter networks ideas and topics

Life time of a tweet is very shorter then a FB Status Update

Twitter is a far faster medium to broadcast a message then FB