First, it is good Netiquette to share videos on multiple networks. Then, do upload where possible. Given, more exposure.
Cross Promo Netiquette For Videos
Next, there are many video networks. Also, Social networks allow video upload. Plus, micro blogs allow users to share links from other networks.
Video Cross Promo
It follows, amateur video is friendly. As a result, not produced to make a profit. Hence., for fun and entertainment only. Sharing with contacts is friendly. Posting video on multiple networks provides a great opportunity to share.
Cross Promo Netiquette
Share on multiple networks because it is a great way to connect with contacts.