diff --git a/src/Config.js b/src/Config.js
index 8ad66d5..aa3fde2 100644
--- a/src/Config.js
+++ b/src/Config.js
@@ -3,8 +3,10 @@ import React, { PureComponent } from 'react';
 import './Config.css';
 
 const BUILTIN_IMGS = {
-  'https://www.tsinghua.edu.cn/images/footer.jpg':
-    '清华紫（默认）',
+  'https://cdn.jsdelivr.net/gh/thuhole/webhole@gh-pages/static/bg/gbp.jpg':
+    '怀旧背景（默认）',
+  'https://www.tsinghua.edu.cn/image/nav-bg.jpg':
+    '清华紫',
   'https://cdn.jsdelivr.net/gh/thuhole/webhole@gh-pages/static/bg/gbp.jpg':
     '寻觅繁星',
   'https://cdn.jsdelivr.net/gh/thuhole/webhole@gh-pages/static/bg/eriri.jpg':
@@ -23,7 +25,7 @@ const BUILTIN_IMGS = {
 
 const DEFAULT_CONFIG = {
   background_img:
-    'https://www.tsinghua.edu.cn/images/footer.jpg',
+   '//cdn.jsdelivr.net/gh/thuhole/webhole@gh-pages/static/bg/gbp.jpg',
   background_color: '#113366',
   pressure: false,
   easter_egg: true,
@@ -452,10 +454,10 @@ export class ConfigUI extends PureComponent {
           <p>
             新功能建议或问题反馈请在&nbsp;
             <a
-              href="https://github.com/newthuhole/hole-backend/issues"
+              href="https://git.thu.monster/newthuhole/hole_thu_backend/issues"
               target="_blank"
             >
-              GitHub <span className="icon icon-github" />
+              Gitea
             </a>
             &nbsp;提出。
           </p>
diff --git a/src/Flows.js b/src/Flows.js
index a3aa721..63596d8 100644
--- a/src/Flows.js
+++ b/src/Flows.js
@@ -271,6 +271,9 @@ class FlowItem extends PureComponent {
                 </div>
               )
             }
+            {
+              info.allow_search && <span> 📢 </span>
+            }
             <Time stamp={info.timestamp} short={!img_clickable} />
           </div>
           <div className="box-content">
@@ -1170,7 +1173,7 @@ export class Flow extends PureComponent {
             }));
           })
           .catch(failed);
-      } else if (this.state.mode === 'search') {
+      } else if (this.state.mode === 'search' && this.state.search_param) {
         API.get_search(page, this.state.search_param, this.props.token)
           .then((json) => {
             const finished = json.data.length === 0;
diff --git a/src/Message.js b/src/Message.js
index 453c363..8474f6a 100644
--- a/src/Message.js
+++ b/src/Message.js
@@ -1,5 +1,5 @@
 import React, { PureComponent } from 'react';
-import { Time } from './Common';
+import { Time, API_BASE } from './Common';
 import { get_json } from './infrastructure/functions';
 
 import './Message.css';
@@ -26,7 +26,7 @@ export class MessageViewer extends PureComponent {
       },
       () => {
         fetch(
-            '/_api/v1/systemlog',
+            API_BASE + '/systemlog',
             {
               headers: {'User-Token': this.props.token},
             }
diff --git a/src/Title.js b/src/Title.js
index 9e30472..bba77b1 100644
--- a/src/Title.js
+++ b/src/Title.js
@@ -136,7 +136,7 @@ class ControlBar extends PureComponent {
               className="control-search"
               value={this.state.search_text}
               placeholder={
-                this.props.mode === 'attention' ? '在关注列表中搜索' : '搜tag或 #树洞号, 如: 新手导引'}
+                this.props.mode === 'attention' ? '在关注列表中搜索' : '关键词 / tag / #树洞号'}
               onChange={this.on_change_bound}
               onKeyPress={this.on_keypress_bound}
             />
diff --git a/src/UserAction.css b/src/UserAction.css
index 6f73792..e7c49a4 100644
--- a/src/UserAction.css
+++ b/src/UserAction.css
@@ -40,6 +40,7 @@
 
 .post-form-bar label {
     flex: 1;
+    margin: 0 0.5rem; 
 }
 
 .post-form-bar input[type=file] {
diff --git a/src/UserAction.js b/src/UserAction.js
index df7cc8c..db18ea3 100644
--- a/src/UserAction.js
+++ b/src/UserAction.js
@@ -24,7 +24,7 @@ const MAX_IMG_DIAM = 8000;
 const MAX_IMG_PX = 5000000;
 const MAX_IMG_FILESIZE = 450000 * BASE64_RATE;
 
-const REPOSITORY = 'https://github.com/newthuhole';
+const REPOSITORY = 'https://git.thu.monster/newthuhole/';
 const EMAIL = 'hole_thu@riseup.net';
 
 export const TokenCtx = React.createContext({
@@ -99,7 +99,7 @@ export function InfoSidebar(props) {
           </a>
           协议在{' '}
           <a href={REPOSITORY} target="_blank">
-            GitHub
+            Gitea
           </a>{' '}
           开源。
         </p>
@@ -260,6 +260,7 @@ export class ReplyForm extends Component {
   on_submit(event) {
     if (event) event.preventDefault();
     if (this.state.loading_status === 'loading') return;
+    if (!this.state.text) return;
     this.setState({
       loading_status: 'loading',
     });
@@ -362,6 +363,7 @@ export class PostForm extends Component {
     this.state = {
       text: '',
       cw: '',
+      allow_search: false,
       loading_status: 'done',
       img_tip: null,
       preview: false,
@@ -369,6 +371,7 @@ export class PostForm extends Component {
     this.img_ref = React.createRef();
     this.area_ref = React.createRef();
     this.on_change_bound = this.on_change.bind(this);
+    this.on_allow_search_change_bound = this.on_allow_search_change.bind(this);
     this.on_cw_change_bound = this.on_cw_change.bind(this);
     this.on_img_change_bound = this.on_img_change.bind(this);
     this.color_picker = new ColorPicker();
@@ -378,6 +381,12 @@ export class PostForm extends Component {
     if (this.area_ref.current) this.area_ref.current.focus();
   }
 
+  on_allow_search_change(event) {
+    this.setState({
+      allow_search: event.target.checked,
+    });
+  }
+
   on_cw_change(event) {
     this.setState({
       cw: event.target.value,
@@ -394,6 +403,7 @@ export class PostForm extends Component {
     let data = new URLSearchParams();
     data.append('cw', this.state.cw);
     data.append('text', this.state.text);
+    data.append('allow_search', this.state.allow_search ? '1' : '');
     data.append('type', img ? 'image' : 'text');
     if (img) data.append('data', img);
 
@@ -547,6 +557,7 @@ export class PostForm extends Component {
   on_submit(event) {
     if (event) event.preventDefault();
     if (this.state.loading_status === 'loading') return;
+    if (!this.state.text) return;
     /*
     if (this.img_ref.current.files.length) {
       this.setState({
@@ -628,6 +639,15 @@ export class PostForm extends Component {
               &nbsp;发表
             </button>
           )}
+
+          <label>
+            <input
+              type="checkbox"
+              onChange={this.on_allow_search_change_bound}
+            />
+            允许被搜索
+          </label>
+
         </div>
         {!!this.state.img_tip && (
           <p className="post-form-img-tip">