It is very easy. Just go to the video lke Ex (URL likehttp://www.youtube.com/watch?R=uferZ2yUsdf)
Below the video you will see the < Embed > link as shown in following image
Login to your account. Click on it. You will get Embed code. You can customize width and other options there. Just copy that code. Now create a new post(or edit existing post). There are two sections Edit HTML and Compose. Pste embed code to the Edit HTML section. Publish post.
Do the same with other online videos. Share this post with your friends.