All of this information is available in many places online. As always, abuse and spam will get you nowhere in SEO!
If you're doing nothing more than just posting things all over the place all you're doing is spamming. But if you are doing a lot of other things right and you want to experiment by increasing the number of search-engine recognized appropriate inbound links to your content without adding a lot to your workload, try some of the listings below.
If you'd like to learn more about link building in social media, do follow or not, read How Social Media can help improve Organic Search Rankings.
Blogs that doFollow
I've always felt that if you're writing about something you care about, and participating helpfully in conversations on other blogs that care about the same thing, the natural growth of links back to your content is a good thing.
Spamming doesn't work here. Most of these blogs won't even let you in the door unless you can prove you have a real contribution to make. They moderate like crazy. Look for blogs you would read and contribute to regardless of follow policy.
Semi-automated bookmarking services online
These have been used/tested by Web Success Diva during their social bookmarking activities. I don't use these myself.
- Post Toaster: 60 social bookmarking and social news sites. It’s a little quirky when you first start using it, but does help speed up your social bookmarking once you get the hang of it. It’s one of the few that semi-automates the most sites.
- Socializer: 50 sites. Functions much like Post Toaster.
- OnlyWire: 30+ sites, but has a much more friendly user interface. You can sign-up for all your accounts in one easy place, and it’s one of the few that actually automates pretty much the entire process. Great for those new to social bookmarking.
- Social Marker: 40+ sites, with a friendly user interface.