You can check out my Diigo Twitter links here, with some subcategories too like building your PLN with Twitter, using Twitter with students, etc. — just look down the left-hand size for related tags.
I've still got lots of items I need to annotate: lots of good stuff in there! And the list keeps growing! If you have suggestions, tweet them to me at @OnlineCrsLady with the hashtag #OUTechExpo.