Bitcoin and the 21st century digital gold rush

It seems that everyday now a new Bitcoin article comes out on the media that announces a spike in the value of the crypto-coin. Articles span between some kids that got insanely rich with small investments to the unbelievable amount of energy the all mining network consumes. Only in the last month the exchange rate for Bitcoin doubled and it’s more than 3x since 6 months ago. Is this the begin of a bubble in crypto-currencies? Is there anything we can learn from it?