Determine the valence intensity of the following tweet, considering the mental state of the author. Assign a real number between 0 and 1, where 0 denotes extremely negative and 1 denotes extremely positive.
Tweet: How do you feel about @Snapchat new feature #SnapMap 👎👍❓ #twitterpoll #polls #vote #Poll #Snapchat  #twitter #tech #technology