mslina2002 - 8:58 pm on Sep 23, 2012 (gmt 0)
(1) You surrender your content to Pinterest.
(2) Your visitors will see your content on Pinterest and no longer need your website.
(3) Your content can be hotlinked from Pinterest to anywhere on the web without your knowledge or consent.
(4) Your website will compete against its own content displayed on Pinterest in the SERPs.
(5) The pinterest.com/source/yourwebsite.com is an aggregate of your pinned content and tends to rank rather highly.
(6) Pinterest links are nofollow, it's shooting oneself in the foot before the race gets started.
When pinterest came out not sure what to make of it. So still evaluating and perhaps that is why I have not been actively pinning and promoting. Still observing the impact. However I haven't seen any negatives thus far as you have pointed out. If I do see negative impact, the "no pin" meta will go on but so far it's fine.
In my case:
1. True and not true. All images are marked with my domain name so even if the images are used/reused/repinned it is not as image worthy as the original pictures without watermarks. It's not an actual watermark but a border at the bottom with the domain name. If it's a large image than I may also add a faded watermark. I guess that's the price you pay for little bit of traffic and branding. Perhaps that's why I see more type in traffic for my domain name as well. Also, if I am actively posting a pin I will upload a teaser pin that will draw them to my site so all original content is still on my site. And yes, even my teaser is watermarked. So pin all you want.
2. True and not true. Since it's a DIY site I get lots of click through to view the content and users will friend, tweet, bookmark, share or produce an Adsense click. Some even buy. Any of these actions are a good to me. However, for some content that don't require detail explanations I am sure I am loosing visitors from that since they won't require access to the site to understand an image or concept.
3. Hotlink taken care of in htaccess.
4. Not true. My site gets the original content first with lots of content + keywords. I also make sure I upload into WMT and for Google to grab the page and submit to the index for me.
5. Have not seen that at all.
6. Yup. We all know that we don't get any link juice but it's the human visitors we want. They are the ones that will link to you and share.