@Jack (Dorsey) quits Instagram, putting the first name handle up for grabs

Jack Dorsey deleting his Instagram account and the potential availability of the @jack handle.

Key points:

1. Jack Dorsey, co-founder of Twitter and former CEO, has deleted his Instagram account, which had the coveted @jack handle.
2. Dorsey stopped using Instagram after it was sold to Facebook and Twitter's attempt to buy it was rejected.
3. The timing of the account deletion is interesting as Instagram now competes with Twitter, but Dorsey has backed other social networks that compete with Twitter.

Hint on Elon Musk: Elon Musk's acquisition of Twitter (now X) is mentioned in relation to Dorsey retaining a stake in the company.