Analytics startup Mixpanel has raised $500,000 from PayPal co-founder Max Levchin and Bebo co-founder Michael Birch, according to Venturebeat. The startup provides a custom analytics tool, which it claims is more robust than those offered by rivals, like Google (NSDQ: GOOG) Analytics. For instance, Mixpanel says it provides data in real-time and also lets customers track various ways website users are interacting with their content beyond viewing pages, such as how many people are watching videos, commenting, or how they’re using a Facebook app.