It costs nothing to open a facebook account.
Facebook is free, but using it on your mobile phone is going to require an internet connection which does cost money!
At the moment it doesn't cost anything to sign up for facebook.
No.
You can't enjoy Facebook, Facebook is a noun. People enjoy USING Facebook :)
You cannot access Facebook account using Gmail. You have to use it using the Facebook site only. Gmail is just for confirming the account.
Facebook started using hashtags in 2013. Many people like to use hashtags on Facebook and Twitter.
yes you can login using mobile number in facebook on the main facebook login page.
Yes, you could before, using Habbo Hotel's Facebook App, but since Facebook's Updates on Dec. 9th, you can no longer buy Habbo Credits, using Facebook Credits.
Log in using Facebook.
No CostNo, Facebook accounts are free.
No, you can't delete Facebook using Gmail. To delete Facebook, you have to go on their website. Gmail just is an interface.