Do I need to include my personal and business social media accounts?

Include only the accounts that matter to your professional relationship with whoever gets the card. More handles is not better, relevant handles are.

• Add accounts that represent your brand, showcase your work, or give a prospect real value.
• Leave off purely personal profiles that mix vacation photos and off-topic posts.
• Think about the recipient: what would a potential client or collaborator actually want to see?
• When in doubt, one strong professional account beats three scattered ones.