From time to time, I check the bookmarks of SEOs who are using SB sites for link building. One thing I’ve noticed that is a big no-no — you’re not alternating the tags.
Anchor text is one of the most important indicators that Google and MSN use to determine what a website is about. Having the same tag, or anchor text, associated with a link on all of your SB sites will diminish their own effect, plus minimize the possible advantages granted for the link itself.
There is always a temptation to use onlywire or one of the other automated bookmarking tools. If you do use them, make sure to split it up amongst 3 or 4 different submissions. In other words, use the tools, but submit a site once with only a few SB sites checked, then resubmit with another set, and on and on.
Google doesn’t like it when the same anchor is used constantly. They want websites rankings and link building to be natural. They don’t want googlebombing or any other form of SERP manipulation.
It will take more time, but it is worth the effort.