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social.sdf.org
Languages English (en)
Users 320
Active users (last month) 88
Active users (last six months) 112
Characters per post (max) 500
Known instances 27,975
First sight Nov 30, 2022 UTC
Last successful check Feb 16, 2026 UTC
Noxious No
New No
Software Mastodon 4.2.29
Registrations Open (by admin approval)
Meta’s Threads moderation Unknown (this instance is not listed in the Anti-Meta Fedi Pact list), and its list of moderated instances is not accessible.
Most used hashtags (last week) caturday, SilentSunday, hashtaggames, DiscountMoviesOrPlays, Monsterdon, alien, 4dman1959, 4dman
Short description
SDF Social is a private Mastodon instance for members of the SDF Public Access UNIX System
Long description
SDF members are welcome to request access to this private Mastodon instance.
Use of the word "Mastodon" has been explicitly granted to SDF by Mastodon gGmbH
Instance rules
  1. This server abides by the Mastodon Covenant
  2. Organizations are welcome to engage with the community in a non-commercial, non-advertising manner.
  3. Artists, musicians, writers and artisans are welcome to engage with the community regarding their craft.
  4. Do not engage in harassment, hateful content or posts of a derogatory nature.
  5. Do not make advertising posts for the sake of purely promoting a commercial product or service.
  6. Content originating from this site may not be used for machine training or other data mining activities without the individual author's consent.
Moderated instances [?]
Not available
Instances certainly moderating this instance [?]
None
Admin account SDF@social.sdf.org
Date of creation Nov 24, 2022 UTC
Display name SDF
Bio
SDF Public Access UNIX System
https://sdf.org
Statistics
Last 12 weeks activity (totals: 1328 statuses, 725 logins, 3 registrations)
S: 85
L: 67
R: 0		S: 105
L: 68
R: 0		S: 84
L: 65
R: 1		S: 130
L: 67
R: 0		S: 98
L: 64
R: 0		S: 144
L: 67
R: 0		S: 157
L: 67
R: 0		S: 79
L: 66
R: 1		S: 165
L: 67
R: 0		S: 94
L: 61
R: 1		S: 183
L: 62
R: 0		S: 4
L: 4
R: 0
Last checks (green: OK; red: KO)
2/9/26, 3:37:01 AM UTC2/10/26, 3:13:57 AM UTC2/11/26, 2:16:40 AM UTC2/12/26, 3:48:20 AM UTC2/13/26, 2:26:01 AM UTC2/14/26, 2:41:57 AM UTC2/15/26, 2:52:52 AM UTC2/16/26, 2:11:30 AM UTC
Succesful checks: 1098/1106 (99.28%)