| http://www.w3.org/ns/prov#value | - Who would say no to growing their business?The lesson is simple: Make your call to action something that your audience can???t refuse.The entire Groove blog is a content hack in itself (like several other startups, they???ve begun to publicize their metrics in a compellingly transparent way) but this call to action was a part of the reason they grew their blog???s email list to more than 5,000 sub
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