I'd suggest not only posting your own original content, but lining/RT'ing that of others, esp. influential people whose content you (and your audience by extension) find compelling. It should also underscore your own message and brand positioning.

Having advised numerous companies on how to solve the "cold-start" problem of creating a new social property, one of the best ways to generate content and acquire an audience is to utilize others' content to tell your own story. You'll get a broader reach and find people of like mind if you ally yourself with others who're already doing some of the heavy lifting.

What's more, talking about yourself gets tedious, but when others tell your story, it's a more compelling read -- and it puts them in position to to reinforce your own story and message, which is ultimately what you want. You cannot get links & followers without first giving and sharing them.