mememax - 4:20 pm on Dec 1, 2011 (gmt 0)
You have to give to your users all the options, both shares (fb share, tweet this, digg it, and so on) and likes (fb likes, google+, etc). Users will use then the option that best suits them.
However you have to fix a goal. What do you want to achieve? I think that be more social is not enough because you can't measure that and uinderstand if you're failing or not.
- Do you want more brand awareness? Use socialmention.
- Do you want more followers and build a social network? Use klout.
- Do you want more subscriber to your newsletter? Set a new goal in GAnalytics
- Do you want more RSS subscribers? Use feedburner.
I don't know if I've helped you but I think you won't achieve any success if you don't specify your objetive.