It can sometimes be difficult to find contact information for influencers. They might have a contact form, but you'd prefer to send a direct email and track it with Yesware.

Rapportive is a tool used to collect social information about a contact and keep it all in a simple sidebar while writing emails to them through Gmail.

However, you can also use rapportive to confirm a potential contact's email address if their social information pops up in the rapportive bar after you add an email address to your email. This may take a little experimentation but it can occasionally help.

Be respectful with the emails you send and if they don't respond - just leave it for a few months and explore other avenues to getting their attention.