WhatsApp for Android has received a new feature called media visibility. The feature, as its name suggests, allows you to hide or show the WhatsApp media content in the gallery easily with out any other apps. With the new Media visibility feature, you can now choose whether you want to make the media that you’ve received on WhatsApp visible in your gallery or make it limited to WhatsApp only.
This is really helpfull for people joins lot of groups, and people who turn on auto download on wifi networks. WhatsApp Messenger is a freeware and cross-platform messaging and Voice over IP service which is owned by facebook.