If you use Tumblr for marketing, here are some signals to watch out for:

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Topic relevance: Keywords, hashtags, and user interactions determine content relevance to users.
Pin quality: Your pin’s level of engagement, such as likes, saves and comments defines pin quality.
Domain quality: Website safety and visitor engagement impact Pinterest rankings. If visitors feel safe on your website, Pinterest ranks your content highly.
Account quality: Pinterest assesses your account credibility doctor data and posting consistency as a ranking signal. If you’re considering Pinterest marketing, then ensure your account is on the good side.
Recency: The algorithm considers how recently a pin was published and how recently it was updated.
Reddit algorithm
Reddit’s algorithm is designed to rank content based on what’s Hot and Best, guided by key signals like:

The number of upvotes, downvotes and total votes it gets. Reddit uses votes as a signal to determine post relevance.
Recent posts gain more traction and visibility. If you’re marketing on Reddit, ensure you consistently post valuable content.
The types of comments it gets. For example, a comment with nine up-votes and two down-votes will rank higher than a comment with one-up votes and no-down votes.
Tumblr algorithm

User interaction: Tumblr considers likes, reblogs, comments and follows to expand content reach to a broader audience.
Post content: The algorithm uses tags, text, images and multimedia to understand the post context and make recommendations.
Post timing: Newer posts receive higher visibility and are prioritized over older ones.
User preference: Past user interactions, content engagement and followed blogs influence content recommendations.
10 tips for staying ahead of the algorithm and optimizing your content