Sassy Social Share by Team Heateor: Adds share buttons to your posts and pages. I like this because it has the rare combination of features:
- Share buttons can “float” at a fixed screen position (as well as at the top or bottom of posts, if you like).
- User privacy is respected. This doesn’t collect information on your site visitors to sell to advertisers, which is very rare for a plugin of this type.
- Good performance because it’s not firing off messages to outside sites.
- Includes a “follow me” sidebar widget with a reasonably comprehensive set of social media platforms, to direct people to your web presence elsewhere.
This is one of the plugins I routinely install on all sites.