Both silent followers and invisible fans refer to people who follow accounts on Social media without leaving comments or likes.
We use silent or invisible because they make no effort to appreciate what you post on social media.
However, you can still see that they are following so they are interested to some extent.
This is just someone who ticks the 'follow' box and does not the take part in any conversations or input anything whatsoever.
Really, it is just 'a follower.'
However, if you wish to mention that the follower is 'inactive' as a participant, you could descrie this person as a 'passive foloower' or an 'uncommunicative follower."
これは、フォローボタンを押して会話やどんな活動にも参加しない人のことです。
実際にその人はフォロワーですが、そういう人が参加者として活動に参加しないと言いたいのであれば、passive follower'（消極的なフォロワー）又は an 'uncommunicative follower（コミュニケーションをしないフォロワー）."ということができます。
A silent follower is a person who follows someone else on social media, without communicating by leaving any comments.
A secret admirer is a person who admires someone else in secret.
When you are inactive on social media sites like Twitter and follow people without interacting with them; then you may explain it in the following ways:
-She has been quietly following me on social media and thinks I don't know it's her.
-I don't interact with the people I follow online. I'm a silent follower.
-I like following people without interaction.
TwitterなどのSNSで相手と交流せずフォローする人のことは以下のように表せます：
-She has been quietly following me on social media and thinks I don't know it's her.
（彼女はSNSで私を無言フォローしていて、私が彼女だと気づいていないと思っています。）
-I don't interact with the people I follow online. I'm a silent follower.
（私はSNSでフォローする人と交流しません。無言フォロワーです。）
-I like following people without interaction.
（私は交流なしで人をフォローするのが好きです。）
If you follow someone on Facebook/Twitter etc then you are called a 'fan' or 'follower'
To be 'invisible' means that you are there but can't be seen - meaning you are following someone but do not comment or say anything you could also use the word 'silent' as you are quiet and don't say anything
" A ghost follower" - When someone is a ghost follower this refers to someone who is always online, keeping up to date with current posts and photos, since social media has also introduced stories* (such as Snapchat stories or Instagram stories) these ghost followers will view your stories but will never interact with any of your posts.
They will not comment or like anything, thus being a ghost, being there
but not seen.
*Stories - videos or photos that are temporarily posted on your social media account.
These posts usually expire after 24 hours.
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