This is actually a concern. Mastodon should have some way of protecting itself against Meta crawlers and tracking code, assuming Meta hasn't already done all of that.

The Verge: Threads is adding fediverse content to your social feeds theverge.com/news/688267/threa @vergeThe Verge @davidpierce

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If you have a fediverse account, you can quote this note from your own instance. Search https://federate.social/users/dmarti/statuses/114699750653488791 on your instance and quote it. (Note that quoting is not supported in Mastodon.)