Of course, if you're going the paid ad route, you could also use Facebook and Google re-targeting to keep that awareness and interest level high. For example, if you've ever noticed after leaving a particular website, that you begin to see their ad everywhere, there's a particular reason for that. Especially if they've already entered your sales funnel, this is a very powerful way to get them to act.
Entry sources – Monitoring the sources from which people are entering your funnel can be useful data to track, as it gives you ideas for expanding the reach of your marketing campaigns. If, for example, you see that a large number of your prospects are coming from a single guest blog post you did, you can upgrade and expand on it, add a free consultation opportunity on that blog post, and/or find similar guest author positions.
Suppose your furnace goes out in the middle of winter. Your problem is obvious: you need a new furnace. And the solution is easy — you need to call HVAC providers in your area for quotes. But say you need a new car. Should you look for an SUV, a compact car or a mid-size sedan? Even vaguer still, if you’re frustrated with how much your accountant is charging you to do your business’ taxes, you might not even be familiar with all the different solutions, like cloud-based accounting services.

Exits from stage – Similarly, seeing an excessively high number of people falling out of a particular stage is an indication that you aren’t doing enough to answer their questions or you’re asking them for too much of a commitment too early. Add more content to give them the information they need to move forward or make it easier for people to convert (e.g. don’t ask for a phone number when they’re downloading a certain e-book).
The final step in the process is to figure out which metrics you’ll track to determine how well your funnel is functioning. It’s crucial to work with the SQL and MQL data here to track patterns between who closes and how they interact with your site, content, channels, ads, etc. Once you have more information, you can continuously optimize your funnel
“Aligning marketing and sales during the sales funnel does more than just align the teams — it creates better business outcomes,” said Mathew Sweezey, Principal of Marketing Insights at Salesforce. His stance is validated by a SiriusDecisions study that found brands with tightly aligned sales and marketing operations achieve 24% faster three-year revenue growth and 27% faster three-year profit growth. The three easiest ways to ensure marketing and sales alignment will succeed is a common language, co-created shared programs, and a policy to abide by a service level agreement.
If you're wondering what a sales funnel is, simply imagine a real-world funnel. At the top of that funnel, some substance is poured in, which filters down towards one finite destination. In sales, something similar occurs. At the top, lots of visitors arrive who may enter your funnel. However, unlike the real-world funnel, not all who enter the sales funnel will reemerge out from the other end. 
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