Diigo = buggy + bloated Rated 1 out of 5 stars
Great idea. Poorly implemented. If it worked, I would love it, but it doesn't. It says that notes and highlights are persistent, but once I navigate away from the page I was highlighting, everything disappears. I checked and made sure that I was signed on, but it still didn't work.
Conclusion: Diigo is a buggy, bloated application that I will promptly delete.