There are several circumstances where you see starting posts of persons that you don’t follow:

• You subscribed to a hash tag that this person used
• It is a reshared post by one of your followed accounts
• One of your followed accounts had commented on that post

I think it would be a good idea to make it visual you don’t follow this account. But I don’t have a clue how to do it. So my questions are:

• Do you think it would be a nice idea to see this?
• Do you have an idea how to make this visual?