That Facebook guy hasn't a clue what he's talking about.
An ASN (Autonomous System Number, so same thing as 'PIN numbers') doesn't mean someone is a tier 1.
The tier 1s are small set of ISPs that are basically the 'backbone' of the Internet. They are the transit providers that provide connectivity to others that don't interconnect themselves and are the companies people pay to connect and connect for free between themselves only on the whole.
BGP is a routing protocol used between Autonomous Systems on the Internet to allow exchange of traffic. ISPs have ASNs / Autonomous System Numbers registered with regional registrars then a worldwide one.
ZZoomm have an ASN. They pay Xifos Ltd for connectivity and Xifos in turn connect to the rest of the Internet.
To repeat this guy hasn't a clue what he's talking about.
BT Retail Full Fibre 900 // Zen Full Fibre 900 // Faelix FTTP 300
Main router: Mikrotik CCR2004-1G-12S+2XS.
Switches: 1 * CSS326-24G-2S+RM, 2 * CRS309-1G-8S+IN, 2 * CRS305-1G-4S+IN
All connected via Invisilight SMF, wife required subtlety, and DACs.
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