You can check Knowem.com for a good list. I tried to link to it but I haven't been granted linking privileges yet. With that link though you can check blogs, bookmark sites, news, photo, etc etc. Good Luck!
It is very important that you social Bookmark all your marketing methods at every opportunity. Whether you have time to do ten or a hundred it should be taken deadly serious. Social bookmarking sites are like gold and should be treated like it! Here are my favourite Top Social Bookmarking sites http://myeasyonlinepay.com/top-20-social-bookmarking-sites/
why not you search in Google " Top 50 Social bookmarking list..you will get lots of result. ok never mind go here http://www.social-bookmarking-sites-list.com/...here you can find lots of bookmarking site
I just wanted to add that if you are serious about submitting your website to 50 bookmarking sites, you should either have software like Onlywire and Ping.fm to do this for you, or you should hire someone to do it for you. This is the type of work that should always be outsourced.
hello you can also try Claimbrand.com lets you check profiles availability for free on 600 social networks and lets you claim the profiles for half the price of knowem. i think it worth it to try
social bookmarking sites list http://alltypestuffs.blogspot.in/2012/12/social-bookmarking-sites-list.html social bookmarking sites list 2013 http://alltypestuffs.blogspot.in/2013/01/social-bookmarking-sites-list-2013.html
Social bookmarking site with high page rank are very important for SEO tasks. For getting social bookmarking site, you can install add-ons such as "add this", then you will get more than 300 social bookmarking websites.