There are about 20 factors right now, which I've been tuning over time. They are applied as I'm able to get the data for the talk. Here is a selection- 1. Is t

There are about 20 factors right now, which I've been tuning over time. They are applied as I'm able to get the data for the talk. Here is a selection- 1. Is the publisher of the talk good? (whitelist) 2. Is the talk referenced in social media (e.g. HN) 3. Safe for work (i.e. you could use in a lunch and learn) 4. Length (15-50 minutes preferred) 5. Is the speaker a keynote level speaker? 6. Are there closed captions? Can the video be embedded? 7. How often does the speaker say 'um' (or similar) 8. Is the talk in English (there are some in Russian and Arabic, but only small collections) 9. Are there notable audio quality issues (channel balance) 10. If it's a historic talk, older talks get higher ranking 11. If it's a technical talk, these get lower ranking, unless you filter to that 12. Is the speaker influential enough to have a wikipedia article? 13. Has the speaker written books? 14. What is the role of the institution that sponsored the talk (conferences are neutral, think tanks, etc lose some ranking)