Introduced the 2nd semester CT class to Diigo. Tried a different way to get them signed up, by e-mailing invitations. Many of the e-mails did not go through, because I had the wrong one, or because...? Did I miss typing some of them? Students who got the e-mail then had to sign on with an account. They could use Diigo account, but didn't know how to create one. Could use Google. Then there were students who tried to download the toolbar and got at least two error messages.
I'm going back to the way I did it 1st semester.