Networks and youtube

Hi guys, I know using network services is good to rank well a website on the search engines, it is a well estabilished method.
I am on youtube, in the niche of music covers, and I noticed that my competitors have their video posted on some networks, with great results, I also saw wich networks they used. Now I am wondering, posting articles with youtube urls works really that well in ranking a video? (these guys are always ranked in the firts positions of the youtube search engine and have really great social signals) Anyone tried or have experience in that? Also, because I identified some networks, there is some way I can contact the network owner and make an agreement to make my videos posted there, or the only chance I have is to rely on people that offers this services here on blackhat?
Suggestions?
Thanks to everyone and regards.

Are you talking about blog networks? If so, you don't need that much power to rank YouTube videos. Social bookmarks do the trick

Yes I know, but when my competitors use that trick, at least I have to do the same, or do some other thing that overkill their tecnique.
Got any idea to obtain a large amount of social bookmarking other than buying it?
Which networks do you suggest for youtube videos?