It means "learn picture" in Chinese. It's in the title. 識圖 even though the pinyin is not that pleasant to people who knows English, Baidu is a Chinese search engine and most of the users are Chinese speaking users. Furthermore, as a Chinese speaking person I can well make fun of it by saying "shxt" every time the engine spits out the right image!
I don't know why you got donwvoted, your comment is perfectly valid. Plenty of case studies about Anglo-Saxons making silly linguistic faux pas in other countries, including China. China has a huge domestic market but the companies there will eventually also have business case studies warning against "shitty" linguistic mistakes ;)
This, however, is a site in Mandarin targeted at Chinese. "Shitu" is not intended for Western markets, it just happens to appear in Latin script in a URI.