Yesterday, Facebook announced several changes to its advertising policies related to the marketing of blockchain, cryptocurrency, and other financial products.

Last June, Facebook changed its advertising policies so that prior written approval was required before an advertiser could market cryptocurrency products on Facebook. After yesterday's policy changes, prior approval is no longer required for ads related to blockchain technology, industry news, education, or events related to cryptocurrency.

Facebook also said that, effective June 5th, it will no longer accept advertising promoting CFDs (contracts for difference) -- which it said are "often associated with predatory behavior."

Facebook said, "We're committed to preventing misleading advertising on our platforms, especially in the area of financial products and services. Because of this, people who want to promote cryptocurrency and closely related products like cryptocurrency exchanges and mining software and hardware, will still have to go through a review process."