==============================================
UPDATE 1 (Aug 16, 8AM): Upgrade in progress…
UPDATE 2 (Aug 16, 5PM): Although earlier we have alerted users in our blog / user forum / user dashboard area about the scheduled downtime / upgrade that’s going on now, some users have emailed or tweeted, wondering why the downtime is taking so long. Don’t worry – all is going as planned. Please note that this is not just a regular site maintenance, but a major server and database upgrade to provide you with speedier performance and to support Diigo’s rapidly growing user base. We hope to have the site rollout in a few more hours. Please also note that bookmarking during the server downtime won’t be saved.
UPDATE 3 (Aug 16, 10PM): Site is back.
UPDATE 4 (Aug 16, 10:15PM): Heavy backend computation at the moment – rebuilding the tag search index (any tag-related search | feed & speed will be temporarily affected)… We apologize for any inconvenience that this may cause. Thanks for your understanding.
UPDATE 5 (Aug 17, 11:00AM): New Diigo FF toolbar feature: Quick Access Filter (see here)
UPDATE 6 (Aug 17, 2:00PM): Some users reported toolbar signin issue. Look like a mac issue. Looking into it now.
UPDATE 7 (Aug 18, 6:00AM): FF mac signin issue should be resolved. Please reinstall the latest toolbar and advise.
UPDATE 8 (Aug 18, 7:00AM): Tag search re-indexing completed. You should be able to access your tags data now. Full text search re-indexing will probably take another day or so (ie. search box on the upper right hand corner not functional yet.)
UPDATE 9 (Aug 18, 9:00AM): Group email alert service resumed.
UPDATE 10 (Aug 19, 6:00AM): Daily blog post service resumed.
Please email us or report to our user forum any issue that you have noticed. Thanks
===============================================
On Friday, Aug 15 starting from 11pm PDT (Saturday, Aug 16, 6:00 am GMT), Diigo will be unavailable while we conduct a major backend upgrade to provide better performance, and in preparation for what’s coming up in the pipeline…
Your Diigo Team
ps: Follow us on Twitter for whispers, early news, reviews, and updates from Diigo!
Diigo 
I love diigo
Diigo rocks! I miss it already. Come back soon 🙂
Hi,
When the rebulding the search index would finish?
Mario,
Tag search re-indexing completed. You should be able to access your tags data now. Full text search re-indexing will probably take another day or so.