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"We now require captcha on many social features, such as following people, joining groups, etc. For a very nominal fee, you can upgrade yourself to "Social Membership," which would grant you full social features without capcha, plus a lot of other goodies. We expect to stop the vast majority of the spammers with this simple measure. We'd like to elaborate more about Social Membership and its pricing and our thoughts behind the decisions. As long-time Diigo users know, Diigo is a personal knowledge management tool on the one hand, and a knowledge-sharing community on the other hand. While it is perfectly fine to use Diigo solely as the former, we do believe that the value of the knowledge-sharing community could be substantial, as the number of active users increases, and as the spam is minimized. As a result, we have decided to set the social membership annual fee at $5/year on Oct 1, 2014, and will increase the price gradually thereafter according to a pre-determined formula, as the number of active social members increases. To reward existing users, an attractive promotion price of $2/year will be available until Oct. 1, 2014. For future years, you will continue to pay the low annual price you paid in the first year, as long as your credit card stay valid for automatic renewal. We have also taken this opportunity to re-adjust our pricing plan to better align users needs with our business model. Existing basic and premium users will be automatically upgraded to Standard in the new pricing plan."

Attenzione a quel "new pricing plan" https://www.diigo.com/premium che limita drasticamente il numero dei gruppi per le formule meno care, ma non è chiaro cosa succederà ai gruppi creati con formula gratuita.