No, unless you turn on your mobile data option.
The messenger app is already in facebook, you can use it if you want to.
Yes. You can use Messenger using a mobile phone number. Just tap the "Not on Facebook?" button.
No not really. Messenger is an independent app, you can work with it even when you dont have facebook app.
Facebook messenger does have some security issues that have people concerned but other use it and say they have no problems using it and are not concerned about it.
Data is wifi. The only way a smartphone can use wifi without having a data plan is when it is connected to wifi at a building.
There is no information on if Jon and Kate Gosselin use instant messenger. All instant messenger, Twitter, Facebook, and Myspace accounts claiming to be the Gosselins have been proven fraudulent.
Someone can find Facebook's data protection policy on the About section of the official Facebook website. There one can find details of their 'Data Use Policy'.
No
Yes, Facebook dose not use a lot of data to load.
only what you initially put on you profile. Facebook can not secretly spy on you true your iPhone or go true personal data that is not on you profile. an exception to this rule is what you search on Facebook it self.
Blackberry messenger is a data service, unlike texting, which is SMS (short message service). If you have a Blackberry you likely have a data plan, and BBM uses very little amounts of data, and Blackberrys themselves use less data than other smartphones tend do because they go through a different server. Check your plan, because some come with a certain amount of data, and many offer unlimited social networking and instant messaging, which includes BBM. If you're shopping around, make sure to keep that in mind.
By texting them using their cellphone. They can also use a program like Textfree or Yahoo Messenger to send messages to people on Facebook while not on Facebook.