Topsy was an analytics service that Apple bought and then shuttered - <a href="http:&#x2F;&#x2F;www.wsj.com&#x2F;articles&#x2F;SB10001424052702304854804579234450633315742" rel="nofollow">http:&#x2F;&#x2F;www.wsj.com&#x2F;articles&#x2F;SB100014240527023048548045792344...</a>