1. StumbleUpon toolbar (for registered SU users).
Most useful features:
- review, vote for and tag any page you visit;
- search for pages submitted by your friends;
- browse through submissions within a channel (e.g. Flickr);
- quickly access your favorites;
- see and analyze a page SU ranking withing search results.
2. SocialPhile – displays page Digg rankings withing search results:
Most useful features:
- find pages that were popular at Digg;
- instantly access Digg submission page to view the discussion and reviews.
3. ShareAholic – lets you submit and view submission progress at a number of popular social media sites:
4. Co.mments button – track comments at social media sites that do not allow automatic tracking (e.g. Sphinn).
5. TwitterFox (and the like) allows for quick and easy communication at Twitter.
Most useful features:
- highlights replies to you @;
- updates you of your unread messages;
- let you quickly send private messages.
