Here’re a few ways how  a social media expert can help your company:

• Train you and your staff on social media concepts, technologies and best practices
• Advise what strategy or approach might work for your business or stated objectives
• Provide you with tools, technology (such as analytics, facebook app etc) related to social media to achieve above objectives
• Execute certain resource intensive tasks on your behalf- such as generate good content for your blog, do link building for SEO purposes
• Manage some social media based events on your behalf (like a twitter contests)

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