it will ultimately cause users to spend more time on site when they can send sms or email very easily through FB. for instance, i neglect to use FB chat a lot b

it will ultimately cause users to spend more time on site when they can send sms or email very easily through FB. for instance, i neglect to use FB chat a lot because i'm not sure if the user is really logged in - if it instantly became an email or SMS so i know it would reach the recipient, i would use it more