diff --git a/src/lib.rs b/src/lib.rs
index 54de55a..5829080 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -44,6 +44,7 @@ pub async fn run(config: &Config) {
 
         // if we wanted to cut toot in half, now would be the right time to do so
 
+        // treats media
         for media in toot.media_attachments {
             let id = match media.r#type {
                 AttachmentType::Image => {
@@ -77,12 +78,20 @@ pub async fn run(config: &Config) {
             medias.push(id);
         }
 
-        println!("{:?}", medias);
+        // threads if necessary
+        let reply_to = toot.in_reply_to_id.and_then(|t| {
+            read_state(&conn, Some(t.parse::<u64>().unwrap()))
+                .ok()
+                .flatten()
+                .map(|s| s.tweet_id)
+        });
 
-        let tweet_id = post_tweet(&config.twitter, &tweet_content, &medias)
+        // posts corresponding tweet
+        let tweet_id = post_tweet(&config.twitter, &tweet_content, &medias, &reply_to)
             .await
             .unwrap_or_else(|e| panic!("Cannot Tweet {}: {}", toot.id, e));
 
+        // writes the current state of the tweet
         write_state(
             &conn,
             TweetToToot {
diff --git a/src/twitter.rs b/src/twitter.rs
index 0e60136..8078c90 100644
--- a/src/twitter.rs
+++ b/src/twitter.rs
@@ -7,7 +7,7 @@ use reqwest::{
     Body, Client,
 };
 use serde::{Deserialize, Serialize};
-use std::error::Error;
+use std::{error::Error, ops::Not};
 use tokio::time::{sleep, Duration};
 
 const TWITTER_API_TWEET_URL: &str = "https://api.twitter.com/2/tweets";
@@ -20,24 +20,32 @@ const TWITTER_METADATA_MEDIA_URL: &str =
 struct EmptyRequest {}
 
 #[derive(Serialize, Debug)]
-pub struct Tweet {
-    pub text: String,
-    pub media: TweetMediasIds,
+struct Tweet {
+    text: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    media: Option<TweetMediasIds>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    reply: Option<TweetReply>,
 }
 
 #[derive(Serialize, Debug)]
-pub struct TweetMediasIds {
-    pub media_ids: Vec<String>,
+struct TweetMediasIds {
+    media_ids: Vec<String>,
+}
+
+#[derive(Serialize, Debug)]
+struct TweetReply {
+    in_reply_to_tweet_id: String,
 }
 
 #[derive(Deserialize, Debug)]
-pub struct TweetResponse {
-    pub data: TweetResponseData,
+struct TweetResponse {
+    data: TweetResponseData,
 }
 
 #[derive(Deserialize, Debug)]
-pub struct TweetResponseData {
-    pub id: String,
+struct TweetResponseData {
+    id: String,
 }
 
 #[derive(Deserialize, Debug)]
@@ -112,7 +120,7 @@ pub async fn upload_simple_media(
 
     // upload the media
     let client = Client::new();
-    let res: UploadMediaResponse = client
+    let res = client
         .post(TWITTER_UPLOAD_MEDIA_URL)
         .header(
             "Authorization",
@@ -129,7 +137,7 @@ pub async fn upload_simple_media(
         ))
         .send()
         .await?
-        .json()
+        .json::<UploadMediaResponse>()
         .await?;
 
     debug!("Media ID: {}", res.media_id);
@@ -201,7 +209,7 @@ pub async fn upload_chunk_media(
     debug!("Init the slot for uploading media: {}", u);
     // init the slot for uploading
     let client = Client::new();
-    let orig_media_id: UploadMediaResponse = client
+    let orig_media_id = client
         .post(TWITTER_UPLOAD_MEDIA_URL)
         .header(
             "Authorization",
@@ -221,7 +229,7 @@ pub async fn upload_chunk_media(
         )
         .send()
         .await?
-        .json()
+        .json::<UploadMediaResponse>()
         .await?;
 
     debug!("Slot initiated with ID: {}", orig_media_id.media_id);
@@ -267,7 +275,7 @@ pub async fn upload_chunk_media(
 
     debug!("Finalize media ID: {}", orig_media_id.media_id);
     // Finalizing task
-    let fin: UploadMediaResponse = client
+    let fin = client
         .post(TWITTER_UPLOAD_MEDIA_URL)
         .header(
             "Authorization",
@@ -285,7 +293,7 @@ pub async fn upload_chunk_media(
         )
         .send()
         .await?
-        .json()
+        .json::<UploadMediaResponse>()
         .await?;
 
     if let Some(p_info) = fin.processing_info {
@@ -310,7 +318,7 @@ pub async fn upload_chunk_media(
                     orig_media_id.media_id, wait_sec
                 );
 
-                let status: UploadMediaResponse = client
+                let status = client
                     .get(TWITTER_UPLOAD_MEDIA_URL)
                     .header(
                         "Authorization",
@@ -324,7 +332,7 @@ pub async fn upload_chunk_media(
                     .query(&command)
                     .send()
                     .await?
-                    .json()
+                    .json::<UploadMediaResponse>()
                     .await?;
 
                 let p_status = status.processing_info.unwrap(); // shouldn’t be None at this point
@@ -347,7 +355,8 @@ pub async fn upload_chunk_media(
                             "Processing still pending, waiting {} secs more…",
                             p_status.check_after_secs.unwrap() // unwrap is safe here,
                                                                // check_after_secs is only present
-                                                               // when status is pending
+                                                               // when status is pending or in
+                                                               // progress
                         );
                         sleep(Duration::from_secs(p_status.check_after_secs.unwrap())).await;
                         continue;
@@ -365,15 +374,19 @@ pub async fn post_tweet(
     config: &TwitterConfig,
     content: &str,
     medias: &[u64],
+    reply_to: &Option<u64>,
 ) -> Result<u64, Box<dyn Error>> {
     let empty_request = EmptyRequest {}; // Why? Because fuck you, that’s why!
     let token = get_token(config);
 
     let tweet = Tweet {
         text: content.to_string(),
-        media: TweetMediasIds {
+        media: medias.is_empty().not().then(|| TweetMediasIds {
             media_ids: medias.iter().map(|m| m.to_string()).collect(),
-        },
+        }),
+        reply: reply_to.map(|s| TweetReply {
+            in_reply_to_tweet_id: s.to_string(),
+        }),
     };
 
     let client = Client::new();