At least according to Jeremy Allaire.

He says that bitcoin is going to hit $10k by June 21st and that will mark the start of crypto summer:

(Source: https://www.ccn.com/opinion/jeremy-allaire-bitcoin-to-surpass-10000-in-june-because-of-facebook/2019/06/15/)

Why June 21st?

Well, it is when Facebook is expected to unveil the white paper for the Libra project and Globalcoin.

So far they have struck partnerships with Visa, Mastercard, Paypal, and Uber.

That is pretty much the who's who of payments and ride sharing.

Prices are breaking $9k as I type.