Numbers: Reach, circulation, unique users, social media shares, engagement, hashtag use.
Web traffic to specific campaign landing pages.
A noticeable pick up in calls and customers.
Your trusted peer saying they keep seeing you / your brand.
A new target audience starts to engage with your sales team.
Footfall increases, you get more customers, they can’t stop talking about what you do online.
Influencers proactively ask to work with you. You shift more product, you get more new business calls.
This is measurement at its best.
If you’d like to be more specific, have a look at the latest framework from amec.