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Marketers spend a lot of time drafting poignant email copy, designing wonderfully branded email templates, and crafting succinct and enticing email subject lines that get open and click-through rates skyrocketing. But before hitting send, have you considered if your subscribers will even get the opportunity to read your email?

A Marketer's Guide to Getting Past Email Spam Filters

http://blog.hubspot.com/blog/tabid/6307/bid/30594/A-Marketer-s-Guide-to-Getting-Past-Email-Spam-Filters.aspx
Facebook's social what? Let's clear up the confusion straight away. http://blog.hubspot.com/blog/tabid/6307/bid/30524/The-Ultimate-Guide-to-Marketing-With-Facebook-s-Social-Plugins.aspx

The Ultimate Guide to Marketing With Facebook's Social Plugins

http://blog.hubspot.com/blog/tabid/6307/bid/30557/6-Guidelines-for-Exceptional-Website-Design-and-Usability.aspx

6 Guidelines for Exceptional Website Design and Usability

So you're leveraging SEO and getting found online.