‘Facebook’ or other social sites

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Are the ‘Facebook’ or other social sites really effective to find or recruit new professionals more easily for the high profile vacancies in the organizations?

I don't think Facebook would be a very effective tool to get a job but I am pretty confident that using professional networking sites such as LinkedIn or Xing would help. I was just reading an article a few days ago about a study among recruiters. I am sorry I can't seem to remember where I read it but about 45% of them look for social media profiles of the candidates during the decision making process.

I think yes because they have a large user database, your ad can reach millions.

Facebook is good place for advertising.