Twitter

- Not for me, although I was probably too impatient and didn't take long enough to follow enough people.  I tend to use the internet for finding information, rather than for the social networking thing, so prefer to use websites rather than tweets.  Isn't some of the information just duplicated from one post to another?  When do people find time to do all this?  Oh dear, I sound pretty negative and set in my ways about this!

- my concerns about social networks are partly the privacy issue - do you really know where your profiles etc. are ending up?   Also, I'm not sure I want social networking to replace face-to-face interaction.

- at this stage, I can't see me using Twitter after the Betty Blogger program but you never know.

Diigo

Hey, I'm even catching up with my technically oriented son!

Here are the websites I bookmarked in Diigo

- Brampton Public Library - tags are Brampton and Library
- Expedia - tags are Travel Hotels Flights
- Nestle - tags are Investments Share Prices

Yes, I might continue to use Diigo when I'm doing the research and planning a vacation - good to be able to return to sites easily and archive them rather than going back to History and trying to track them that way.  And be able to access them from any computer.  Also I sometimes help my husband with research for business reports - being able to use the highlight option would make life much easier. 
Glad to learn some new and different tools of the trade.

http://youtu.be/67-GeNYShbc

Yes - good to be able to revisit old favourite TV shows, music, etc. 

Amazing way of reaching many people easily.  And you can share your favourites with friends all at the same time.

I would probably not use YouTube on a regular basis but know that it is a great source for finding music, excerpts from TV shows etc.  that have been enjoyed in the past, as well as many, many other applications.

Well, so far, so good.  I would rate my current knowledge of Web 2.0 as a 3.