No matter how great your domain name (programming.com) is, and how well designed your landing page is: As long as you don't offer something that is significant better than Ohloh, I don't see how this project could gain any traction.
I looked at Ohloh but could neither find "a real social network" nor something "actually useful for programmers". It seems to be just a collection of more or less well-known Open Source projects.
https://www.ohloh.net/
No matter how great your domain name (programming.com) is, and how well designed your landing page is: As long as you don't offer something that is significant better than Ohloh, I don't see how this project could gain any traction.