I open social media accounts 2 days after launching the site, and 2 weeks later, I add the links and embed codes for those accounts to the site. When bookmarking, instead of just links from the site, I share images, songs from YouTube, etc., in between so it looks like a more normal profile, and I write a sentence or two containing my keywords in the description sections, adding a few #hashtags as well. I recommend opening Google+, Reddit, Scoop.it, Delicious, Quup, and Pinterest accounts, and keeping those accounts active along with the site, sharing frequently, and building up followers and likes. One last thing, when you open the accounts, for the first week or so, share natural images, videos, etc., not from your own site, and use them like personal social accounts; I heard it is more effective if you start sharing the site’s links later on.