Manual social bookmarking for more websites

So i have some websites in different niches and i want to do some manual social bookmarking in the top sites, do i need 1 account for every website that i want to bookmark? meaning i have 12 websites now,that means that i have to have 12 separate accounts on every social bookmarking site... 12 digg accounts, and so on? Or 1 account for every social bookmarking website is enough?

No, I think you need only one account. From one account you can register in different social bookmarking sites.

for only 10 sites, I think onein each is enough, just consider bookmarking other sites in between your sites. pick a few well known/ high authority sites to bookmark too so your accounts look more legit.

many sites now allow login using fb or google, you can use it.

1-2 accounts will be ok for 12 websites!