How to Submit Dofollow Social Bookmarking Sites?

You can use one account for bookmarking your sites. Building a good reputation at social bookmarking sites adds up to the traffic you are getting. Why? Because when you post useful/informative links, people will trust you more instead of just posting all your sites' URLs. On the other hand, creating multiple accounts with the same computer gives you a higher risk of getting flagged. And even if you create multiple accounts using different computers/IPs, it may still be tracked specially when you bookmark exactly the same URLs. Do natural bookmarking for your sites.. just add your blog posts randomly and use single account which will not be counted as spam. I suggest mixing your posts. Good Luck.