more famous hashtags exemples for profile page

templates/profile.html

@@ -327,7 +327,7 @@
                  <div class="input-group tagbox-container">
                    <label for="hashtags" class="smlabel input-group-addon tagbox-label">Interest groups</label>
                    <input id="hashtags" name="hashtags" maxlength="350"
-                          type="text" class="form-control" placeholder="eg #dataviz, #networks, #rochebrune2018"
+                          type="text" class="form-control" placeholder="ex: #residentISC, #gis, #bigdata, #CCS17, #scala, #python, #ecmlpkdd2018"
                           value="{{ current_user.info.hashtags }}">
                  </div>
                  <p class="legend">(press TAB or ENTER after each)</p>