Tumblr’s new rules :::: People should read this
“Non-Genuine Social Gesture Schemes. Don’t participate in schemes to gain non-genuine gestures like follows or reblogs. Don’t orchestrate or engage in “follow trains,” where users are encouraged to follow lists of other users to gain more followers for themselves. Don’t scatter deceptive links to your blog or Follow pages. Don’t make bulk or indiscriminate use of messaging features like Fan Mail or Asks to bait followers.
Unauthorized Contests, Sweepstakes, or Giveaways. Take a look at our guidelines for contests, sweepstakes, and giveaways, which are incorporated here by reference, for more information.
Privacy Violations. Don’t use Tumblr to deceptively obtain personal information. Don’t post content that violates anyone’s privacy, including personally identifying or confidential information like credit card numbers, social security numbers, unlisted contact information, or private photos of your ex’s junk (no matter how attractive).”
(Taken from Tumblr’s new Terms of Service - Community Guidelines)