Social Bookmarking is the best way of creating backlinks to the site. You can bookmark/submit your blogs, pages or content on bookmarking sites such as Reddit, StumbleUpon, Tumblr, etc. These bookmarking sites are crawled daily and hence your site may also get crawled frequently. You should post your content with suitable tags to maximize the post reach.
List of Social Bookmarking sites-
a) www.pinterest.com
b) www.tumblr.com
c) www.reddit.com
d) www.delicious.com
e) www.stumbleupon.com
f) www.storify.com
g) www.diigo.com
h) www.scoop.it
i) www.slashdot.org
j) www.digg.com
k) www.myspace.com
l) www.Fark.com
m) www.Plurk.com
n) www.bibsonomy.org
o) www.google.com/bookmarks