You can set a KPI – Key Performance Indicator – for any aspect of marketing.
A KPI is something that you can measure against an objective.
Here are some marketing KPI examples that can be measured within a given time period (i.e. per month):
Website KPIs
* New URLs added
* Website unique visitors (new versus returning)
* Website page views
* Average time on site
* Bounce rate
Email marketing KPIs
* New subscribers
* Newsletter open rate
* Newsletter click-through rate
* Conversion rate (if appropriate)
* Subscriber engagement rating
Social media KPIs
* Blogs written
* Facebook Likes, Comments, Shares, Friends added
* LinkedIn connections made + Likes, Comments, Shares
* Twitter followers gained + Likes., Comments, Shares
Media relations KPIs
* Journalist conversations
* Press releases sent
* Articles placed
* Media interviews
Customer KPIs
* Customers lost
* Customers retained
* New customers acquired
* Customer acquisition cost
* Customer lifetime value
Bear in mind that there are over 300 promotional techniques and KPIs can be set for all of them.