<img src="http://bitcoinmagazine.com/.image/c_limit%2Ccs_srgb%2Cfl_progressive%2Ch_1200%2Cq_auto:good%2Cw_1200/MTc5Mjk3ODExODQ5ODgxMjM5/why-african-countries-lead-in-bitcoin-searches.jpg" />Today Google has reviewed its advertising guidelines, which now allow cryptocurrency trusts, such as bitcoin exchange-traded funds (ETFs), ...