Social Networking website is a revolutionary idea with a very bright future with further scope for advancements. The opportunities provided from this medium are immense and many organisations are making use of this medium to better their practices. Organisations are no longer at the mercy of the media to advertise or convey their message. With the help of social networking they can advertise or communicate in a more efficient way.
The last answer sets the most formal tone; "Hello! I was very pleased to meet you at the party last week." the rest are very casual.
