On February 15
No pivotal events are recorded on exactly February 15 — the closest is YouTube is founded, ushering in mass online video on February 14, 2005 (1 day earlier).
This week in history (Feb 12 – Feb 18)
On 14 February 2005 three former PayPal employees, Chad Hurley, Steve Chen and Jawed Karim, founded YouTube, a website that allowed users to upload, share and watch video freely over the internet.