Think about it from a non marketers point of view. If you were using delicious (as many of us do) just to bookmark your favourite sites, you would be bookmarking on all sorts of topics. I bookmark sites on internet marketing, dancing, blogging, recipes, news stories, entertainment/gossip, you tube videos - whatever interests me enough to want to maybe want to look at it again sometime.
So, the answer is - one account will be fine for all.
Please note: You need to use all these sites organically. Not just for your own sites but use them regularly for all webpages that interest you or you find useful. And take the time to read their T&Cs so you don't abuse the system.
Lisa
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