An influencer is an Individual that has the power to affect purchase decisions of others because of their real or perceived authority, knowledge, position, or relationship.
With consumers, members of a peer group act as influencers.
In business to business (B2B) or employees:
Internal - engineers, managers, purchasers
External - consultants or government personnel
BuzzStream - build and manage relationships for the engagement of influencers that you want to reach out to
Little Bird - influencer and advocate marketing