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1. do search engines care if a site is a .com or a .biz ? is this irrelevant to their rankings?
2. is it a bad idea to interlink 20 domains? each is content-rich and different. but all 20 are linked to each other.
3. does "mykeyword1mykeyword2.com" have any preference over "mykeyword1--mykeyword2.com" ?
4. does google know penalize on alt text on small images ? (less than 5x5 pixels) or give more benefit to alt text on large images? or even more benefit on large hyperlinked images?
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