Do you really need to block/spam people just for following you?
Now, I ALWAYS thrown down the spam-hammer if someone tries to get my attention through spammy @mentions, but never for just following me, especially if they're semi-legitimate (like the OP).
Someone who auto-follows me based on a keyword search and posts only links is a spammer trying to raise the number of follow-backs they have and possibly promote their own site/content.
They don't add any meaningful value to Twitter - even the OP's 'curated links' aren't much value given that sites like HN exist and the actual real people I follow on Twitter will post interesting links themselves.
Now, I ALWAYS thrown down the spam-hammer if someone tries to get my attention through spammy @mentions, but never for just following me, especially if they're semi-legitimate (like the OP).