You still have full control over connecting to Google. If you don't want two-way syncing, and you don't trust it, then don't connect. The clause reads "agreeing to enable your users to"; i.e. you get to decide when data is transfered.
Giving permission to Google to share your Google contacts with Facebook is an inherently different action from giving Facebook permission to share your Facebook contacts with Google. This clause simply ensures that you have the choice to go either or both ways.
You still have full control over connecting to Google. If you don't want two-way syncing, and you don't trust it, then don't connect. The clause reads "agreeing to enable your users to"; i.e. you get to decide when data is transfered.
Giving permission to Google to share your Google contacts with Facebook is an inherently different action from giving Facebook permission to share your Facebook contacts with Google. This clause simply ensures that you have the choice to go either or both ways.