Trending

Up to: Features

Trending posts and hashtags to help with content discoverability!

Usage

Go to the Explore tab!

From there you are given four menus,

• Posts
• Hashtags
• People
• News (popular links)

Implementation

Trends are defined in a family of models in mastodon/app/models/trends: https://github.com/NeuromatchAcademy/mastodon/tree/main/app/models/trends

Eg. for Statuses the trending scores are calculated here:

def calculate_scores(statuses, at_time)
  items = statuses.map do |status|
    expected  = 1.0
    observed  = (status.reblogs_count + status.favourites_count).to_f

    score = if expected > observed || observed < options[:threshold]
      0
    else
      ((observed - expected)**2) / expected
    end

    decaying_score = if score.zero? || !eligible?(status)
      0
    else
      score * (0.5**((at_time.to_f - status.created_at.to_f) / options[:score_halflife].to_f))
    end

    [decaying_score, status]
  end

AKA the score is a sum of reblogs and favorites with some exponential time decay.

Config

In the Administration > Server Settings > Discovery menu...

Available options:

• Enable Trends
• Use trends as the landing page
• Allow trends without prior review
• Allow posts with content warnings to trend