Probably in your head But its really hard to remember that many nonsense characters, so in my opinion write it down on paper or store it in cloud keychain
Yep! Social media is a great tool for digital marketing. And by advertising bitcoins you make more people invest in it, so in that way it has influence on bitcoin growth
I think that BTC will be a regular currency for 5 years, with no big fluctuations as it is now. It will be just like euro or dollar, it will get some standard with small fluctuation. But still I think optimistic about future of BTC, specially because it is decentralised (for now)