Privacy concerns on social media cites are a big concern today. You can find out almost anything from their phone number to where they live to what kind of car they drive. No one intends on the information given on these social media cites to be used in the wrong intention. They just have it out there so that people can know a little bit about them. But without their knowing it could be used in the wrong way.
A show called Catfish, which talks about people who had Internet relationships with people that was not really them due to stolen information, is a scenario of what could go wrong. Information such as phone numbers, addresses or personal information like credit/debit card numbers or social security numbers should not be published for others to see. Giving out your birthday should be the furthest you go with giving out information.