Once you've identified your influencers, read their blog, bio, tweets, and find out how they'd like to be contacted.

Some people prefer twitter as an initial introduction, while others may be more open to an invitation on Linkedin or by email.

Contact influencers with a very short message about what you can offer them and a description of your service. But keep it short - this should be an introduction. Also try to focus a little on them and not rant about yourself.

If you're sending an email, be sure to use Yesware for Gmail so that you can see if they've opened it. Treat them like a sales prospect - you don't want to keep sending the same email if they've opened your first one and never responded.