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 to 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.