35 Social Media KPIs

From Chris Lake at Econsultancy: 35 social media KPIs to help measure engagement:

1. Alerts (register and response rates / by channel / CTR / post click activity)
2. Bookmarks (onsite, offsite)
3. Comments
4. Downloads
5. Email subscriptions
6. Fans (become a fan of something / someone)
7. Favourites (add an item to favourites)
8. Feedback (via the site) 
9. Followers (follow something / someone)
10. Forward to a friend
11. Groups (create / join / total number of groups / group activity)
12. Install widget (on a blog page, Facebook, etc)
13. Invite / Refer (a friend)
14. Key page activity (post-activity)
15. Love / Like this (a simpler form of rating something)
16. Messaging (onsite)
17. Personalisation (pages, display, theme)
18. Posts
19. Profile (e.g. update avatar, bio, links, email, customisation, etc)
20. Print page
21. Ratings
22. Registered users (new / total / active / dormant / churn)
23. Report spam / abuse
24. Reviews
25. Settings
26. Social media sharing / participation (activity on key social media sites, e.g. Facebook, Twitter, Digg, etc)
27. Tagging (user-generated metadata)
28. Testimonials
29. Time spent on key pages
30. Time spent on site (by source / by entry page)
31. Total contributors (and % active contributors)
32. Uploads (add an item, e.g. articles, links, images, videos)
33. Views (videos, ads, rich images)
34. Widgets (number of new widgets users / embedded widgets)
35. Wishlists (save an item to wishlist)