Nowadays, increasing many people use facebook , a popular social networking. Facebook brings in many great advantages to the youths, the adults as well as the business men. First of all, Facebook is a website which allows us to communicate easily. It provides several features such as chatting, personal messaging and photo sharing, which enables us to share information with other facebookers conveniently. We can send pictures, videos and even some sweet greetings for someone we like. Besides, we can re-connect with old friends or someone who we have lost touch with for a long time. With the search function of facebook, we can rapidly search for by entering the key words such as his/her name or address. That's change a lot. In addition,people can use facebook as an efficient place to advertise their products. We can only sit in the front of the computer, upload the advertisement and then enter share putton .In a few minutes,this advertisement will spread worldwide like wildfire. Thus we can save money instead of advertising it on the mass media. To sum up, facebook is a popular and useful website for everyone to communicate,re-connect with old or lost friends and promote the businesses.