Conversation so far:
When was Generation Y blocked?
On March 26, 2008, Sánchez announced the recent problems accessing her blog appeared to be a deliberate action on the part of government blocking access to her blog Generation Y.
For how long was Generation Y blocked?
Generation Y blog site's issues seemed to be resolved about a year after the site became unavailable.

Question: Who had blocked it?
Self-contained rewrite: Who had blocked Yoani Sánchez's blog Generation Y?