Pinterest. What is it? Pinterest is an online pinboard. It lets people organize and share things that inspire them. It was built to help people share their taste and what they are into. It's for people who like to collect things... people who are visual. That's what makes it so different. Pinterest is really taking off in the design market. How can fashion bloggers benefit? Share their taste! There aren't that many people who can write or take photos, but want to share their taste. If you're excited about fashion or design, curate some things you love and collect them all on Pinterest. It's a natural fit for fashion bloggers.
Klout. Klout measures influence online. They are different than followers or friend count. They are looking at... are people sharing your content? Are they commenting? They measure that through several different networks - Twitter, Facebook, Instagram, Foursquare, etc. How to up your Klout score? Consistently creating great content is the best tip.
Instagram. You can take a picture that is completely horrible and crappy and Instagram gives you the filters. You can make an amazing image and share it immediately. The instant connection to Foursquare, Tumblr, Twitter, Facebook... you can send it to every place all at once. Tip: Try and make it the same name on Twitter, that way if you get tagged, they are the same on both.
Foursquare. How can bloggers use Foursquare? Everyone that follows you really cares about what you think. One of the greatest reasons to use Foursquare is to get closer to your fans and followers and show them places you love. It's just yet another added value to your blog content. It's giving a persona to your brand by showing the places you frequent.
Tip with platforms: You need to balance your time with platforms. You shouldn't sign up for a platform if you can't use it. It's better to have no profile than a dead profile. Don't take on more than you can handle!