There are several ways to report spam on Tumblr:
- Report a post: From the dashboard or in search results, tap or click the share menu (paper airplane) at the bottom of the post, and hit “Report.” If you're on mobile web, tap the menu at the top right of the post, and select "Report" from the dropdown.
- Report a message: Tap or click "Mark as spam" under the spammer's message. Note that "Mark as spam" won't appear if it's somebody you follow, or somebody you've already had a conversation with. But on mobile, you can always tap the three dots at the top of the conversation and choose "Mark as spam."
- Report a blog: On the web, report an entire blog from the dashboard or in search results by hovering over the blog's avatar, clicking the little person silhouette, and clicking “Report.” On mobile, tap the blog's username to view their blog, then tap the little human icon, and then tap "Report."