Rated 3 out of 5 stars
Shareaholic is probably the original addon for sharing sites and site data across multiple services. For that reason over the years it's always been one of the first addons to grab after reinstalling or upgrading FF, and I've recommended it friends and coworkers over other similar add-ons. Recently, however, I've found Shareaholic falling behind, especially the Firefox extension, which has less support & less functionality than the Chrome or Safari version. Also, new sites are not being supported (most obviously, goo.gl and Google+), support for existing services have broken and not been fixed (bit.ly) and dead services have not been removed (Google bookmarks, reader, buzz). As such, I'd advise others to compare similar sharing extensions in the Firefox extensions gallery before settling with Shareaholic. Hopefully the developers will step it up soon.