Thanks

http://www.dafont.com/forum/read/40083/pinterest-font

this has been here many times before.

I just noticed that the blog referred to is no longer there... so if you are interested in the designers check this out: http://paganandsharp.com/work/#pinterest

It's not a font, it's lettering. Their old logo used the typeface Bello http://www.myfonts.com/fonts/und..., but in April 2011 they replaced it with the current mark, a completely custom design by Michael Deal and Juan Carlos Pagan. You can read more about the project on these sites:
http://thecaseandpoint.com/2011/...
http://www.carlospagan.com/portf...
http://blog.pinterest.com/post/5...

It's very difficult to make a font that connects roman or italic letter shapes in this way, unless you have lots of alternates and ligatures. The letters in this logo, by contrast, were designed to work in a specific order with specific connections. So, hiring a lettering artist is the best way to get what you want in this style.

That said, there are a few of decent attempts, but most require some modification for a natural connection between many of the letters:
FF Jackie https://www.fontfont.com/fonts/j...
Roman Script http://www.fontshop.com/fonts/do...
Kursivschrift http://www.fontshop.com/fonts/si...
Einhorn http://www.fontshop.com/fonts/si...
Salut http://www.fontshop.com/fonts/si...
Jocham http://www.myfonts.com/fonts/hub...
Theorem http://new.myfonts.com/fonts/sud...
ABTS Milk http://new.myfonts.com/fonts/alb...
Madita http://new.myfonts.com/fonts/hub...
You can also achieve a similar style with a casual, monolinear script:
Susa http://new.myfonts.com/fonts/hub...
Galaxie Cassiopeia http://vllg.com/Constellation/Ga...
more: http://www.fontshop.com/fontlist...