Link preview fetchers

When someone shares your URL on a social network or in a chat app, the service fetches the page to build a preview card. That fetch is a bot, not the person who shared it.

20 known bots from 13 operators. 13 have their own page with user agents, robots.txt tokens and sources.

Bot	Operator	Type
AddThis.com	Clearspring Technologies, Inc.	Social Media Agent
Bluesky	Bluesky Social PBC	Social Media Agent
Discord Bot	Not known	Service Agent
Facebook Crawler	Meta	Social Media Agent
facebookexternalhit	Meta/Facebook	Listed by ai.robots.txt
FediList	Not known	Social Media Agent
Friendica	Not known	Social Media Agent
KeybaseBot	Zoom Video Communications, Inc	Social Media Agent
LinkedIn Bot	LinkedIn	Social Media Agent
Magpie-Crawler	Brandwatch	Social Media Agent
Mastodon Bot	Not known	Social Media Agent
Meta-ExternalAds	Meta Platforms, Inc.	Social Media Agent
Meta-ExternalFetcher	Meta	Social Media Agent
Meta-WebIndexer	Meta Platforms, Inc.	Social Media Agent
Pinterest	Pinterest	Crawler
Reddit Bot	reddit inc.	Social Media Agent
Skype URI Preview	Skype Communications S.à.r.l.	Service Agent
Slackbot	Slack	Crawler
TelegramBot	Not known
Twitterbot	Twitter	Social Media Agent

Names, operators and types from Matomo Device Detector (LGPL-3.0) and ai.robots.txt (MIT). Category from running Vireo Analytics' bot filter on each bot's user agent. About this data.