Revert "add sharing on tumblr, weibo and renren"

This reverts commit 2f3162c80d6ef6f59a73e24f429a6ca2f0bf62a8.
Revert "Revert "add sharing on tumblr, weibo and renren""

This reverts commit ed35e8bb3277f845b6c6af9df55e3a0731b019ce.