Ask HN: Is there a Rapportive-like service to get info on your customers?

I'd love to (and pay for) an API that I could plug into my admin panels to figure out a little context about my customers.<p>For example: it'd be great to know where they went to school, where they work and have links to their LinkedIn etc.<p>An amazing added feature could be to alert me anytime a specific type of user has signed up.<p>We have our customers' emails and names.<p>Anyone know of such a product/service?