Dogster.com lets owners create profiles for pooches. Featuring nearly 450,000 pup pages, the site offers forums for owners to talk with one another as well as with veterinarians.
Ravelry.com has “attracted tens of thousands of knitters.” The site helps them organize projects and share designs, as well as “trade patterns, offer advice for getting through knotty problems, and critique one another’s creations.”
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