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This is the culprit. The bot deletes zero-score unanswered questions (with fewer than 2 comments) after 365 days. The spike that you observe is not a spike in questions posted, but a reverted wave of questions deleted. In the March snapshot, this wave of deletion is in March 2014 (around week 10). In the current snapshot, it is in July 2014.

Removal of abandoned questions after 365 days is the 3rd most common deletion reason on Stack Overflow, trailing only the deletion of questions and answers by their authors.

This is the culprit. The bot deletes zero-score unanswered questions (with fewer than 2 comments) after 365 days. The spike that you observe is not a spike in questions posted, but a reverted wave of questions deleted. In the March snapshot, this wave of deletion is in March 2014 (around week 10). In the current snapshot, it is in July 2014.

Removal of abandoned questions after 365 days is the 3rd most common deletion reason on Stack Overflow, trailing only the deletion of questions and answers by their authors.

This is the culprit. The bot deletes zero-score unanswered questions (with fewer than 2 comments) after 365 days. The spike that you observe is not a spike in questions posted, but a reverted wave of questions deleted. In the March snapshot, this wave of deletion is in March 2014 (around week 10). In the current snapshot, it is in July 2014.

Removal of abandoned questions after 365 days is the 3rd most common deletion reason on Stack Overflow, trailing only the deletion of questions and answers by their authors.

This is the culprit. The bot deletes zero-score unanswered questions (with fewer than 2 comments) after 365 days. The spike that you observe is not a spike in questions posted, but a reverted wave of questions deleted. In the March snapshot, this wave of deletion is in March 2014 (around week 10). In the current snapshot, it is in July 2014.

Removal of abandoned questions after 365 days is the 3rd most common deletion reason on Stack Overflow, trailing only the deletion of questions and answers by their authors.

This is the culprit. The bot deletes zero-score unanswered questions (with fewer than 2 comments) after 365 days. The spike that you observe is not a spike in questions posted, but a reverted wave of questions deleted. In a March snapshot, this wave of deletion is in March 2014 (around week 10). In the current snapshot, it is in July 2014.

This is the culprit. The bot deletes zero-score unanswered questions (with fewer than 2 comments) after 365 days. The spike that you observe is not a spike in questions posted, but a reverted wave of questions deleted. In the March snapshot, this wave of deletion is in March 2014 (around week 10). In the current snapshot, it is in July 2014.

Removal of abandoned questions after 365 days is the 3rd most common deletion reason on Stack Overflow, trailing only the deletion of questions and answers by their authors.