diff --git a/.env.template b/.env.template
index 8b8c8ec..4ed0ca1 100644
--- a/.env.template
+++ b/.env.template
@@ -1,2 +1,3 @@
 SN_AUTH_COOKIE=
+SN_USERNAME=hn
 HN_AUTH_COOKIE=
diff --git a/hn.go b/hn.go
index c42fb7b..fda1104 100644
--- a/hn.go
+++ b/hn.go
@@ -159,3 +159,16 @@ func HackerNewsUserLink(user string) string {
 func HackerNewsItemLink(id int) string {
 	return fmt.Sprintf("%s/item?id=%d", HackerNewsUrl, id)
 }
+
+func FindHackerNewsItemId(text string) int {
+	re := regexp.MustCompile(fmt.Sprintf(`\[HN\]\(%s/item\?id=([0-9]+)\)`, HackerNewsUrl))
+	match := re.FindStringSubmatch(text)
+	if len(match) == 0 {
+		log.Fatal("No Hacker News item URL found")
+	}
+	id, err := strconv.Atoi(match[1])
+	if err != nil {
+		panic(err)
+	}
+	return id
+}
diff --git a/main.go b/main.go
index 27fa5c6..5080f00 100644
--- a/main.go
+++ b/main.go
@@ -1,9 +1,88 @@
 package main
 
+import (
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/joho/godotenv"
+	"github.com/namsral/flag"
+)
+
+var (
+	SnUserName string
+)
+
+func init() {
+	err := godotenv.Load()
+	if err != nil {
+		log.Fatal("Error loading .env file")
+	}
+	flag.StringVar(&SnUserName, "SN_USERNAME", "", "Username of bot on SN")
+	flag.Parse()
+	if SnUserName == "" {
+		log.Fatal("SN_USERNAME not set")
+	}
+}
+
+func GenerateHnComment(id int, sats int, nComments int) string {
+	lnInvoiceDocs := "https://docs.lightning.engineering/the-lightning-network/payment-lifecycle/understanding-lightning-invoices"
+	return fmt.Sprintf(
+		""+
+			"Your post received %d sats and %d comments on %s [0].\n\n"+
+			"To claim your sats, reply to this comment with a LN address or invoice [1].\n\n"+
+			"You can create a SN account to obtain a LN address.\n"+
+			"\n\n"+
+			"[0] %s/r/%s (referral link)\n\n"+
+			"[1] %s",
+		sats,
+		nComments,
+		StackerNewsUrl,
+		StackerNewsItemLink(id),
+		SnUserName,
+		lnInvoiceDocs,
+	)
+}
+
+func GenerateSnReply(sats int, nComments int) string {
+	return fmt.Sprintf("Notified OP on HN that their post received %d sats and %d comments.", sats, nComments)
+}
+
 func main() {
 	stories := FetchHackerNewsTopStories()
 	filtered := CurateContentForStackerNews(&stories)
 	for _, story := range *filtered {
 		PostStoryToStackerNews(&story)
 	}
+
+	items := FetchStackerNewsUserItems(SnUserName)
+	now := time.Now()
+	for _, item := range *items {
+		duration := now.Sub(item.CreatedAt)
+		if duration >= 24*time.Hour && item.Sats > 0 {
+			log.Printf("Found SN item (id=%d) older than 24 hours with %d sats and %d comments\n", item.Id, item.Sats, item.NComments)
+			for _, comment := range item.Comments {
+				if comment.User.Name == SnUserName {
+					snReply := GenerateSnReply(item.Sats, item.NComments)
+					// Check if OP on HN was already notified
+					alreadyNotified := false
+					for _, comment2 := range comment.Comments {
+						if comment2.User.Name == SnUserName {
+							alreadyNotified = true
+						}
+					}
+					if alreadyNotified {
+						log.Println("OP on HN was already notified")
+						break
+					}
+					text := comment.Text
+					hnItemId := FindHackerNewsItemId(text)
+					hnComment := GenerateHnComment(item.Id, item.Sats, item.NComments)
+					CommentHackerNewsStory(hnComment, hnItemId)
+					CommentStackerNewsPost(snReply, comment.Id)
+					break
+				}
+			}
+		}
+	}
 }
diff --git a/sn.go b/sn.go
index 8c20e34..1765e0a 100644
--- a/sn.go
+++ b/sn.go
@@ -34,17 +34,19 @@ type User struct {
 	Name string `json:"name"`
 }
 type Comment struct {
-	Id   int    `json:"id,string"`
-	Text string `json:"text"`
-	User User   `json:"user"`
+	Id       int       `json:"id,string"`
+	Text     string    `json:"text"`
+	User     User      `json:"user"`
+	Comments []Comment `json:"comments"`
 }
 type Item struct {
 	Id        int       `json:"id,string"`
 	Title     string    `json:"title"`
 	Url       string    `json:"url"`
 	Sats      int       `json:"sats"`
-	CreatedAt string    `json:"createdAt"`
+	CreatedAt time.Time `json:"createdAt"`
 	Comments  []Comment `json:"comments"`
+	NComments int       `json:"ncomments"`
 }
 
 type UpsertLinkResponse struct {
@@ -63,11 +65,13 @@ type ItemsResponse struct {
 }
 
 var (
-	SnApiUrl     string
-	SnAuthCookie string
+	StackerNewsUrl string
+	SnApiUrl       string
+	SnAuthCookie   string
 )
 
 func init() {
+	StackerNewsUrl = "https://stacker.news"
 	SnApiUrl = "https://stacker.news/api/graphql"
 	err := godotenv.Load()
 	if err != nil {
@@ -207,12 +211,22 @@ func FetchStackerNewsUserItems(user string) *[]Item {
 					title
 					url
 					sats
+					createdAt
 					comments {
+						id
 						text
 						user {
 							name
 						}
+						comments {
+							id
+							text
+							user {
+								name
+							}
+						}
 					}
+					ncomments
 				}
 				cursor
 			}
@@ -251,3 +265,7 @@ func FetchStackerNewsUserItems(user string) *[]Item {
 
 	return &items
 }
+
+func StackerNewsItemLink(id int) string {
+	return fmt.Sprintf("%s/items/%d", StackerNewsUrl, id)
+}