Follows and Follows-of-follows casts a pretty wide net. I follow only around 200 people and that gives me WoT of 12916 people, good enough to create an enjoyable feed and I haven't seen any airdrop spam since.

The only issue with this now is it may make it a bit more difficult for brand new accounts who aren't followed by anyone yet. But I think there are solutions for this, and it's a much more nice problem to solve rather than playing cat and mouse with spammers.