How do I know if someone has seen a message I sent on Facebook Messenger?

You have sent a message to your friend and did not get a reply, wondering if they read or even realized your message.

In this post, you will get details about how Facebook Messenger uses different icons for your messages to be sent, delivered, and read or not.
The Facebook message can be sent via the website as well as through the mobile app. If someone has not installed Messenger on their phone they get a notice that they have a message unread. Later they can read the message on the website or they can decide to install the app on their phone.

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Facebook Messenger

Facebook Messenger works very similarly on the website or app version. One can easily find if someone has read their message or not. They just need to know icons and their relation.

Below is the web version of Facebook Messenger, it is very similar to the mobile phone version you do not see the left and right boxes on the app.

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How do I know if someone has seen a message I sent to Messenger?

Here just know what these Facebook icons say about your messages. By knowing these signs you can know if your message has been seen by your friends or not and also the time they read it.
Facebook Messenger on web and mobile app version is very similar just the design differ. So, focus on what the Facebook messenger icon says.
A blue circle means your message is sending
A blue circle with a check means your message has been sent
A filled-in blue circle with a check means your message has been delivered
A small version of your friend or contact’s photo will pop up below the message when they’ve read it

Also, know these icons

A small profile photo with the gray letter f means they did not install Messenger on the mobile phone.
A small profile photo with a message logo means they have a messenger app on their mobile phone.