diff --git a/.env.example b/.env.example
index 95ae791..d93a5c2 100644
--- a/.env.example
+++ b/.env.example
@@ -1,6 +1,7 @@
 AWS_ACCESS_KEY_ID=
 AWS_SECRET_ACCESS_KEY=
 AWS_S3_BUCKET=
+DISABLE_S3=false
 
 MYSQL_USER=root
 MYSQL_PASSWORD=secret
diff --git a/pages/index.vue b/pages/index.vue
index 5443ab1..1b34fef 100644
--- a/pages/index.vue
+++ b/pages/index.vue
@@ -53,6 +53,9 @@
       <b-button
         v-if="isContributeBtnDisabled && status.type === 'is-success'"
         type="is-primary"
+        tag="a"
+        href="https://twitter.com/intent/tweet?text=Hello%20world"
+        target="_blank"
         outlined
       >
         Tweet about your contribution
diff --git a/server/controllers/contributions.js b/server/controllers/contributions.js
index e156ceb..9acadb9 100644
--- a/server/controllers/contributions.js
+++ b/server/controllers/contributions.js
@@ -1,28 +1,30 @@
-// const aws = require('aws-sdk')
-// const s3 = new aws.S3()
 const fs = require('fs').promises
 const path = require('path')
 const util = require('util')
 const exec = util.promisify(require('child_process').exec)
+const aws = require('aws-sdk')
 const express = require('express')
-const router = express.Router()
 const { Mutex } = require('async-mutex')
-const mutex = new Mutex()
 const multer = require('multer')
+
+const mutex = new Mutex()
+const s3 = new aws.S3()
+const router = express.Router()
 const Contribution = require('../models/contributions.model.js')
 const upload = multer({ dest: '/tmp/tornado' })
 
-// async function uploadToS3(response) {
-//   const currentContributionIndex = await Contribution.currentContributionIndex()
-//   return await s3
-//     .upload({
-//       Bucket: process.env.AWS_S3_BUCKET,
-//       Key: `response_${currentContributionIndex}`,
-//       ACL: 'public-read',
-//       Body: response
-//     })
-//     .promise()
-// }
+async function uploadToS3({ filename }) {
+  const currentContributionIndex = await Contribution.currentContributionIndex()
+  const fileContent = await fs.readFile(`/tmp/tornado/${filename}`)
+  return s3
+    .upload({
+      Bucket: process.env.AWS_S3_BUCKET,
+      Key: `response_${currentContributionIndex}`,
+      ACL: 'public-read',
+      Body: fileContent
+    })
+    .promise()
+}
 
 async function verifyResponse({ filename }) {
   console.log('Running verifier')
@@ -56,7 +58,6 @@ router.post('/response', upload.single('response'), async (req, res) => {
     const currentContributionIndex = await Contribution.currentContributionIndex()
     try {
       console.log(`Started processing contribution ${currentContributionIndex}`)
-      // await fs.writeFile('/tmp/new.params', req.file.response.data)
       await verifyResponse({ filename: req.file.filename })
     } catch (e) {
       console.error('Error', e)
@@ -66,11 +67,9 @@ router.post('/response', upload.single('response'), async (req, res) => {
 
     try {
       console.log('Contribution is correct, uploading to storage')
-      // await uploadToS3(req.files.response.data)
-      // await fs.copyFile(
-      //   '/tmp/new.params',
-      //   `./snark_files/response_${currentContributionIndex}`
-      // )
+      if (process.env.DISABLE_S3 !== 'true') {
+        await uploadToS3({ filename: req.file.filename })
+      }
 
       console.log('Committing changes')
       await fs.rename(`/tmp/tornado/${req.file.filename}`, './server/snark_files/current.params')
diff --git a/server/models/contributions.model.js b/server/models/contributions.model.js
index ed350c6..d02fe4c 100644
--- a/server/models/contributions.model.js
+++ b/server/models/contributions.model.js
@@ -1,40 +1,41 @@
-const db = require('./db.js')
 const crypto = require('crypto')
+const db = require('./db.js')
 
 let sql
-const Contributions = { }
+const Contributions = {}
 
 Contributions.currentContributionIndex = async function() {
-  const [rows,] = await sql.query('select max(id) as max from contributions')
+  const [rows] = await sql.query('select max(id) as max from contributions')
   return (rows[0].max || 0) + 1
 }
 
 Contributions.insertContributionInfo = async function(name, company) {
   const token = crypto.randomBytes(32).toString('hex')
-  await sql.execute(
-    'insert into contributions(token, name, company) values(?, ?, ?)',
-    [token, name, company]
-  )
+  await sql.execute('insert into contributions(token, name, company) values(?, ?, ?)', [
+    token,
+    name,
+    company
+  ])
 }
-  
+
 Contributions.updateContributionInfo = async function(token, name, company) {
-  await sql.execute(
-    'insert into contributions(token, name, company) values(?, ?, ?)',
-    [token, name, company]
-  )
+  await sql.execute('insert into contributions(token, name, company) values(?, ?, ?)', [
+    token,
+    name,
+    company
+  ])
 }
 
 Contributions.getContributions = async function() {
-  const [rows,] = await db.execute('select id, name, company from contributions')
+  const [rows] = await db.execute('select id, name, company from contributions')
   return rows
 }
 
-
-async function main () {
-  ({ sql } = await db())
+async function main() {
+  ;({ sql } = await db())
   const contribitionIndex = await Contributions.currentContributionIndex()
   console.log('Next contribution index is', contribitionIndex)
 }
 main()
 
-module.exports = Contributions
\ No newline at end of file
+module.exports = Contributions
diff --git a/server/snark_files/current.params b/server/snark_files/current.params
index b089a9a..c8960fe 100644
Binary files a/server/snark_files/current.params and b/server/snark_files/current.params differ