When China banned Bitcoin exchanges in September 2017, Bitcoin's price plunged from nearly $5,000 to $3,700 in two weeks. South Korea, Israel and Russia are currently exploring ways to crack down on crypto exchanges.
In 2018, the U.S. regulatory environment could also get tougher on the industry. The tax reform bill that recently passed Congress proposes to close a Bitcoin loophole, making "like kind exchanges" applicable only to real estate property. The IRS could require all crypto trades to be taxable under section 1031, requiring much work in accounting for gains and losses of each trade. With these kind of news including that of facebook, the price of Bitcoin is subject to be heavily influenced negatively. Given this, the price is bound to go down and some will sell to cut losses. A good strategy is to hold your Bitcoins until the price slowly increases again.