Facebook, instagram or any other social media platform being down has nothing to do with bitcoin and it's prices.
Besides social mediums are not coins in the cryptocurrency world
From what I heard they were testing some new algos that are supposed to implement acta rules. They are trying to block free speech, content sharing, and the spread of information. Acta is internet censorship and it will lead to most youtube content creators disappearing for good. Only decentralized platforms will survive.
Well people should have fled to p2p alternatives, such as
Diaspora. I dislike Facebook and the like. Not only you should go p2p, but secure and obfuscated p2p, such as Diaspora thru Tor or something similar.
Living in a country that blocks thousands of sites for having opposition views, i have come to realize the importance it is to strengthen these initiatives. Do not ignore them because in your freedom you don't seem to need them. This is like people ignoring Bitcoin because their fiat is so great (ie. USD o EUR). But by the time a fiat goes the inflationary spiral it is too late to react, you won't see it coming, trust me, a million yearly inflation last year but it might reach 10 million or more this year, should "socialists" remain in power that is.
For better IM you have
several choices, I haven't tried that elixxir but have used riot.im. One thing i dislike from Signal is that it is too much a clone of Whatsapp, and i consider whatsapp design abominable. If anything, i'd rater have a Telegram open source p2p clone.
But yeah, the giant problem is always convincing the others to stop using those garbage centralized and proprietary social media apps...