diff --git a/aggregator/aggregator.go b/aggregator/aggregator.go
index ab34039..698cf07 100644
--- a/aggregator/aggregator.go
+++ b/aggregator/aggregator.go
@@ -6,6 +6,7 @@ import (
 	"sort"
 
 	"github.com/mrusme/gobbs/models/post"
+	"github.com/mrusme/gobbs/models/reply"
 	"github.com/mrusme/gobbs/ui/ctx"
 )
 
@@ -36,7 +37,7 @@ func (a *Aggregator) ListPosts() ([]post.Post, []error) {
 	}
 
 	for idx, sys := range a.ctx.Systems {
-		sysPosts, err := (*sys).ListPosts(idx)
+		sysPosts, err := (*sys).ListPosts()
 		if err != nil {
 			errs[idx] = err
 			continue
@@ -60,3 +61,11 @@ func (a *Aggregator) ListPosts() ([]post.Post, []error) {
 func (a *Aggregator) LoadPost(p *post.Post) error {
 	return (*a.ctx.Systems[p.SysIDX]).LoadPost(p)
 }
+
+func (a *Aggregator) CreatePost(p *post.Post) error {
+	return (*a.ctx.Systems[p.SysIDX]).CreatePost(p)
+}
+
+func (a *Aggregator) CreateReply(r *reply.Reply) error {
+	return (*a.ctx.Systems[r.SysIDX]).CreateReply(r)
+}
diff --git a/cmd/root.go b/cmd/root.go
index 3b37847..aae27d1 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -92,6 +92,7 @@ func loadSystems(c *ctx.Ctx) []error {
 		}
 
 		c.AddSystem(&sys)
+		sys.SetID(c.NumSystems() - 1)
 	}
 
 	return errs
diff --git a/models/reply/reply.go b/models/reply/reply.go
index 9be261d..3edf367 100644
--- a/models/reply/reply.go
+++ b/models/reply/reply.go
@@ -7,7 +7,8 @@ import (
 )
 
 type Reply struct {
-	ID string
+	ID        string
+	InReplyTo string
 
 	Body string
 
@@ -18,4 +19,6 @@ type Reply struct {
 	Author author.Author
 
 	Replies []Reply
+
+	SysIDX int
 }
diff --git a/system/discourse/discourse.go b/system/discourse/discourse.go
index aaf9edf..86680b8 100644
--- a/system/discourse/discourse.go
+++ b/system/discourse/discourse.go
@@ -18,11 +18,20 @@ import (
 )
 
 type System struct {
+	ID     int
 	config map[string]interface{}
 	logger *zap.SugaredLogger
 	client *api.Client
 }
 
+func (sys *System) GetID() int {
+	return sys.ID
+}
+
+func (sys *System) SetID(id int) {
+	sys.ID = id
+}
+
 func (sys *System) GetConfig() map[string]interface{} {
 	return sys.config
 }
@@ -75,7 +84,7 @@ func (sys *System) Load() error {
 	return nil
 }
 
-func (sys *System) ListPosts(sysIdx int) ([]post.Post, error) {
+func (sys *System) ListPosts() ([]post.Post, error) {
 	cats, err := sys.client.Categories.List(context.Background())
 	if err != nil {
 		return []post.Post{}, err
@@ -143,7 +152,7 @@ func (sys *System) ListPosts(sysIdx int) ([]post.Post, error) {
 				Name: forumName,
 			},
 
-			SysIDX: sysIdx,
+			SysIDX: sys.ID,
 		})
 	}
 
@@ -184,8 +193,54 @@ func (sys *System) LoadPost(p *post.Post) error {
 				ID:   strconv.Itoa(i.UserID),
 				Name: i.Name,
 			},
+
+			SysIDX: sys.ID,
 		})
 	}
 
 	return nil
 }
+
+func (sys *System) CreatePost(p *post.Post) error {
+	categoryID, err := strconv.Atoi(p.Forum.ID)
+	if err != nil {
+		return err
+	}
+
+	ap := api.CreatePostModel{
+		Title:     p.Subject,
+		Raw:       p.Body,
+		Category:  categoryID,
+		CreatedAt: time.Now().Format(time.RFC3339),
+	}
+
+	cp, err := sys.client.Posts.Create(context.Background(), &ap)
+	if err != nil {
+		return err
+	}
+
+	p.ID = strconv.Itoa(cp.ID)
+	return nil
+}
+
+func (sys *System) CreateReply(r *reply.Reply) error {
+	inReplyTo, err := strconv.Atoi(r.InReplyTo)
+	if err != nil {
+		return err
+	}
+
+	ap := api.CreatePostModel{
+		Raw:       r.Body,
+		TopicID:   inReplyTo,
+		CreatedAt: time.Now().Format(time.RFC3339),
+	}
+
+	cp, err := sys.client.Posts.Create(context.Background(), &ap)
+	if err != nil {
+		return err
+	}
+
+	r.ID = strconv.Itoa(cp.ID)
+
+	return nil
+}
diff --git a/system/hackernews/hackernews.go b/system/hackernews/hackernews.go
index 3210f13..6156594 100644
--- a/system/hackernews/hackernews.go
+++ b/system/hackernews/hackernews.go
@@ -16,11 +16,20 @@ import (
 )
 
 type System struct {
+	ID     int
 	config map[string]interface{}
 	logger *zap.SugaredLogger
 	client *hn.Client
 }
 
+func (sys *System) GetID() int {
+	return sys.ID
+}
+
+func (sys *System) SetID(id int) {
+	sys.ID = id
+}
+
 func (sys *System) GetConfig() map[string]interface{} {
 	return sys.config
 }
@@ -57,7 +66,7 @@ func (sys *System) Load() error {
 	return nil
 }
 
-func (sys *System) ListPosts(sysIdx int) ([]post.Post, error) {
+func (sys *System) ListPosts() ([]post.Post, error) {
 	stories, err := sys.client.TopStories(context.Background())
 	if err != nil {
 		return []post.Post{}, err
@@ -121,7 +130,7 @@ func (sys *System) ListPosts(sysIdx int) ([]post.Post, error) {
 
 			Replies: replies,
 
-			SysIDX: sysIdx,
+			SysIDX: sys.ID,
 		})
 	}
 
@@ -168,6 +177,8 @@ func (sys *System) loadReplies(replies *[]reply.Reply) error {
 			Name: i.By,
 		}
 
+		re.SysIDX = sys.ID
+
 		for _, commentID := range i.Kids {
 			re.Replies = append(re.Replies, reply.Reply{
 				ID: strconv.Itoa(commentID),
@@ -181,3 +192,11 @@ func (sys *System) loadReplies(replies *[]reply.Reply) error {
 
 	return nil
 }
+
+func (sys *System) CreatePost(p *post.Post) error {
+	return nil
+}
+
+func (sys *System) CreateReply(r *reply.Reply) error {
+	return nil
+}
diff --git a/system/lemmy/lemmy.go b/system/lemmy/lemmy.go
index 32e79d4..5597ed5 100644
--- a/system/lemmy/lemmy.go
+++ b/system/lemmy/lemmy.go
@@ -17,11 +17,20 @@ import (
 )
 
 type System struct {
+	ID     int
 	config map[string]interface{}
 	logger *zap.SugaredLogger
 	client *lemmy.Client
 }
 
+func (sys *System) GetID() int {
+	return sys.ID
+}
+
+func (sys *System) SetID(id int) {
+	sys.ID = id
+}
+
 func (sys *System) GetConfig() map[string]interface{} {
 	return sys.config
 }
@@ -81,7 +90,7 @@ func (sys *System) Load() error {
 	return nil
 }
 
-func (sys *System) ListPosts(sysIdx int) ([]post.Post, error) {
+func (sys *System) ListPosts() ([]post.Post, error) {
 	resp, err := sys.client.Posts(context.Background(), types.GetPosts{
 		Type:  types.NewOptional(types.ListingSubscribed),
 		Sort:  types.NewOptional(types.New),
@@ -133,7 +142,7 @@ func (sys *System) ListPosts(sysIdx int) ([]post.Post, error) {
 				Name: i.Community.Name,
 			},
 
-			SysIDX: sysIdx,
+			SysIDX: sys.ID,
 		})
 	}
 
@@ -177,7 +186,17 @@ func (sys *System) LoadPost(p *post.Post) error {
 				ID:   strconv.Itoa(i.Comment.CreatorID),
 				Name: i.Creator.Name,
 			},
+
+			SysIDX: sys.ID,
 		})
 	}
 	return nil
 }
+
+func (sys *System) CreatePost(p *post.Post) error {
+	return nil
+}
+
+func (sys *System) CreateReply(r *reply.Reply) error {
+	return nil
+}
diff --git a/system/system.go b/system/system.go
index 152432f..3df4bde 100644
--- a/system/system.go
+++ b/system/system.go
@@ -4,6 +4,7 @@ import (
 	"errors"
 
 	"github.com/mrusme/gobbs/models/post"
+	"github.com/mrusme/gobbs/models/reply"
 	"github.com/mrusme/gobbs/system/adapter"
 	"github.com/mrusme/gobbs/system/discourse"
 	"github.com/mrusme/gobbs/system/hackernews"
@@ -12,6 +13,8 @@ import (
 )
 
 type System interface {
+	SetID(id int)
+	GetID() int
 	GetConfig() map[string]interface{}
 	SetConfig(cfg *map[string]interface{})
 	SetLogger(logger *zap.SugaredLogger)
@@ -20,8 +23,10 @@ type System interface {
 	Connect(sysURL string) error
 	Load() error
 
-	ListPosts(sysIdx int) ([]post.Post, error)
+	ListPosts() ([]post.Post, error)
 	LoadPost(p *post.Post) error
+	CreatePost(p *post.Post) error
+	CreateReply(r *reply.Reply) error
 }
 
 func New(
diff --git a/ui/ctx/ctx.go b/ui/ctx/ctx.go
index c95017d..4fe0d67 100644
--- a/ui/ctx/ctx.go
+++ b/ui/ctx/ctx.go
@@ -35,3 +35,7 @@ func (c *Ctx) AddSystem(sys *system.System) error {
 	c.Systems = append(c.Systems, sys)
 	return nil
 }
+
+func (c *Ctx) NumSystems() int {
+	return len(c.Systems)
+}