baidu index (known as baidu zhishu) allows users to look up the search volume and trend for certain hot keywords and phrases. it can serve as a baidu keyword research tool. baidu bookmarks (known as baidu soucang) is a social bookmarking service supported by baidu.com; baidu browser is a web browser first released as a beta in july 2011.
baidu.com does not provide customer service by email, but does provide it by phone. there is only one way to reach baidu.com customer service, and it's not email but instead via phone. in case you didn't realize there was an alternative, the best phone number for baidu.com customer support is +8610-5992 7396.