OTT markets

• YouTube: the earliest social video platform, making profit by display & pre-roll ads. seems that hard to cover its costs, thus subscription model called youtube red was released recently.
• Facebook: the largest social friendship platform, making profit by display ad. try to increase traffic by original contents of instant article, video and live streaming. however, video costs much more than image/text. Seems than cost of Facebook ad increases drastically to compensate it recently.
• Netflix: the well-known OTT vendor, making profit via subscription model. Seems working by balancing the cost and the subscription fee.