Web 2.0

1. social bookmarking

1.1. delicious

1.2. citeUlike

1.3. digg

1.4. i-lighter

1.5. librarything

1.6. connotea

1.7. edtags

1.8. clipmarks

2. Social Reposititories

2.1. Youtube

2.2. teachertube

2.3. flickr

2.4. slideshare

2.5. slide