how to promote your videos

I am considering doing some giveaways throughout the summer for my channel of my favorite products. Has anyone ever done them? If so do you have any advice?

I personally have a Tumblr and Facebook page for my channel, post to YouTube Google Plus communities, and I sometimes post to Reddit. What do you do to promote your channels?

Hey there! Recently, I've been interested in promoting my videos more than I had in the past. So, when I post a video, I take the main idea of the video and search for websites that find that particular idea interesting. Then, I message these people however I can and send the link with a brief...