There is of course the Tiny Tack House, which has it's own FB group: https://www.facebook.com/groups/227728120641729/ and Melissa Tack posts great 3d graphic designs for tiny house lay outs frequently which are just wonderful. If you're planning to build a tiny home, I highly recommend this page.
Then there is the Tiny r(E)volution which I've mentioned in a previous post about his podcast. Tiny r(E)volution is run by Andrew and his wife who are building their own tiny home and eventually plan to build some other tiny add ons to create a still small and beautiful space to share as a whole family. Their facebook page is here: https://www.facebook.com/tinyrev
Andrew recently shared about some people who are new to the tiny house community, Together Simply. Of course, I love the name. You can find them on blogspot here: http://togethersimply.blogspot.com/
I would also recommend you check out http://tinycasita.blogspot.com/ as well as http://tinywhitenorth.com/ and www.costaricamountain.blog
Oh and I shouldn't neglect to mention Tiny House Design: http://www.tinyhousedesign.com/2012/07/28/tiny-house-fire/ who have a post about a tiny house builder whose tiny home on a trailer was parked behind a farm that burnt down, and thus BURNT DOWN. Tragic! So if you would like to donate towards her rebuilding her tiny home, please do so! I did, and will continue to contribute whenever I can. The tiny house community can be very supportive of each other, and that's one of the many things I love about it. Some day I will build my own tiny home and be able to commune with my fellow tiny house neighbors around the world via the internet!
And in case you just can't get enough of looking at tiny homes, don't forget the Tiny House Blog, which is not in itself so tiny. Tons of photographs, articles, and more: http://tinyhouseblog.com/